Illumination device and use of the illumination device

Abstract

The invention relates to an illumination device for hair, comprising a support device (110) which defines an interior space (111) with an outer contour (112), wherein the interior space (111) of the support device (110) is dimensioned such that the support device (110) is suitable for at least partially surrounding a human head at a distance. A plurality of light sources (310, 320, 330) are arranged on the support device (110, 350) in a distributed manner, wherein each light source (310, 320, 330) is configured to emit a light cone (312, 322, 332) directed towards the interior space (111). The light sources (310, 320, 330) are arranged and can be controlled by a control device (340) such that light cones (312, 322, 332) from adjacent light sources (310, 320, 330) partially overlap in a virtual surface (360) spaced apart from the outer contour (112) and reach an average irradiance (illumination intensity) of 5 to 70 mW / cm2 in the virtual surface (360), wherein the virtual surface (360) extends at a distance of 1 to 70 cm from the outer contour (112) and the virtual surface represents the contour of a human head.

Description

2024-INV-0017 -1 - Lighting device and use of the lighting device

[0001] The invention relates to a lighting device for head hair and scalp, in particular a lighting device to assist photoinduced bleaching of hair for cosmetic and hair care applications. The invention also relates to the use of a lighting device for the optical excitation of a photosensitizer contained in a bleaching agent. The lighting device is particularly suitable for use in beauty salons and hair salons. BACKGROUND

[0002] Hair bleaching is a widely used procedure in hair cosmetics. An oxidizing agent is applied to the hair for a period of time sufficient to achieve the desired degree of bleaching. Typically, a hydrogen peroxide solution with a concentration of 1 to 12% by weight is used as the oxidizing agent. The hydrogen peroxide solution is applied to the hair under alkaline conditions and bleaches the hair by oxidizing melamine, the pigment that gives hair its color.

[0003] To enhance the bleaching effect, a persulfate-based formulation, also known as a "booster," can be added to the hydrogen peroxide solution. Suitable persulfates include sodium, potassium, or ammonium persulfate salts in powder form, which are mixed into the hydrogen peroxide solution before application. The mixed product is then applied to the hair and left on for a specific time to achieve the desired level of lightening.

[0004] It is known to enhance the chemical bleaching effect based on hydrogen peroxide solution and persulfates by a physical component. For example, EP 3 137 171 B1 discloses a method for bleaching hair, comprising (i) a step of applying a composition containing one or more chemical oxidizing agents, and (ii) a step of irradiating the hair with UV-VIS radiation after application of the composition.

[0005] The bleaching of hair under the influence of light is also described in WO 2021 / 185911 A1, WO 2021 / 185920 A1, and US 2021 / 0030643 A 1, whereby the required irradiance is high and therefore undesirable damage can occur. 2024-INV-0017 -2-

[0006] Furthermore, the use of light for medical purposes is known, for example from US 6,663,659 B2 and EP 3 328492 B1. The use of light as a heat source in cosmetic treatments is described in DE 42 35436 B2.

[0007] With existing devices, in addition to the desired bleaching effect from irradiation, the required light intensity can also damage the scalp and hair. Furthermore, the bleaching effect is uneven because not all sections of the hair are illuminated uniformly. Therefore, improvements are needed. SOLUTION

[0008] According to one embodiment described herein, a lighting device for hair, for example head hair, is provided. The lighting device comprises a support structure that defines an interior space with an outer contour, the interior space of the support structure being dimensioned such that the support structure is suitable for at least partially surrounding a human head at a distance. A plurality of light sources emitting radiation in the range of 230 nm to 1000 nm, in particular from 380 nm to 1000 nm, in particular from 380 nm to 900 nm, in particular from 380 nm to 800 nm, in particular from 380 nm to 450 nm, in particular from 390 nm to 430 nm, and in particular from 400 nm to 420 nm, are arranged distributed on the support structure, each light source being configured to emit a cone of light directed towards the interior space. The lighting device further comprises a control device for controlling the light sources.The light sources are arranged and controllable by the control device in such a way that the light cones of neighboring light sources partially overlap in a virtual area spaced from the outer contour and have an average irradiance of 5 to 70 mW / cm. 2 , especially 10 to 50 mW / cm² 2 and in particular 25 to 40 mW / cm² 2 in the virtual area, wherein the virtual area extends from the outer contour at a distance of 1 to 70 cm, in particular 1 to 50 cm, in particular 3 to 50 cm, and in particular 5 to 25 cm, and the virtual area is intended to represent the contour of a human head with hair. The distance of the virtual area from the outer contour is also referred to as distance D. 2024-INV-0017 -3-

[0009] The hair illuminator is particularly suitable and adapted to support photoinduced chemical bleaching of hair for hair cosmetic applications, wherein the radiation emitted by the light sources excites a photosensitizer, which, through this excitation, is enabled to generate singlet oxygen. The radiation emitted by the illuminator excites the photosensitizer as a chemical component to generate singlet oxygen as a bleaching agent. The radiant power of the radiation emitted by the light sources can be adjusted accordingly for this excitation.In particular, the radiation output, and especially the irradiance acting on the head, can be reduced compared to previously known methods where the radiation directly leads to bleaching, since bleaching does not occur directly through the action of the radiation on the hair but indirectly via the radiation-induced excitation of the photosensitizer. This reduces damage to the hair and scalp. Furthermore, the reduced irradiance improves comfort for both the client and the stylist.

[0010] The applications, procedures and uses described here are cosmetic applications and uses, not therapeutic applications, procedures or uses.

[0011] The radiation emitted by the light sources of the illumination device, in particular the wavelength range and the applied irradiance, is adapted to the photosensitizer for the generation of singlet oxygen. Unlike ordinary triplet oxygen (a diradical), singlet oxygen is an excited form of oxygen that possesses a double bond and behaves like an electron-deficient olefin. Particularly when using phenalenones as photosensitizers, it is possible to expose the hair to generate singlet oxygen at a relatively low irradiance by illuminating it in the range of 390 nm to 430 nm, and especially in the range of 400 nm to 420 nm. This irradiance is significantly lower than that typically required for photo-assisted radical imaging, as described, for example, in US 2021 / 0030643 A1.

[0012] According to one embodiment, which can be combined with all embodiments described here, the arrangement of the light sources, in particular the lateral distance between the light sources, is selected and the control device can be controlled in such a way that the average irradiance is between 5 and 70 mW / cm². 2 at a distance of 1 to 70 cm, in particular 1 to 50 cm, in particular 5 to 50 cm, and in particular 5 to 25 cm. The radiation of the light sources can be in the range of 390 nm to 430 nm, and in particular from 400 nm to 420 nm. 2024-INV-0017 -4-

[0013] According to one embodiment, which can be combined with all the embodiments described here, the arrangement of the light sources, in particular the lateral distance between the light sources, is selected and the control device can be controlled in such a way that the average irradiance is between 10 and 50 mW / cm². 2at a distance of 1 to 50 cm, in particular 3 to 50 cm or in particular 5 to 50 cm, in particular 3 to 25 cm, for example 3 to 15 cm, and in particular from 5 to 25 cm. For example, the average irradiance of 10 to 50 mW / cm² can be achieved. 2 This can be achieved at a distance of 3 to 50 cm, in particular 3 to 25 cm, for example 3 to 15 cm. The radiation from the light sources can be in the range of 390 nm to 430 nm, and in particular from 400 nm to 420 nm.

[0014] According to one embodiment, which can be combined with all embodiments described here, the arrangement of the light sources, in particular the lateral distance between the light sources, is selected and the control device can be controlled in such a way that the average irradiance is between 25 and 45 mW / cm². 2at a distance of 1 to 50 cm, in particular 3 to 50 cm or in particular 5 to 50 cm, in particular 3 to 25 cm, for example 3 to 15 cm, and in particular from 5 to 25 cm. For example, the average irradiance of 25 to 45 mW / cm² can be achieved. 2 This can be achieved at a distance of 3 to 50 cm, in particular 3 to 25 cm, for example 3 to 15 cm. The radiation from the light sources can be in the range of 390 nm to 430 nm, and in particular from 400 nm to 420 nm.

[0015] According to one embodiment, which can be combined with all embodiments described here, the arrangement of the light sources, in particular the lateral distance between the light sources, is selected and the control device can be controlled in such a way that the average irradiance is between 25 and 45 mW / cm². 2at a distance of 5 to 20 cm, and especially from 5 to 15 cm. For example, the average irradiance can be 30 to 40 mW / cm². 2 This can be achieved at a distance of 5 to 20 cm. The radiation from the light sources can be in the range of 390 nm to 430 nm, and especially from 400 nm to 420 nm.

[0016] The support device can be designed, in particular, to surround the human head on two sides, for example, on the left and right sides relative to the human head. The support device can also be designed, in particular, to surround the human head on three sides, for example, on the left and right sides and the top side, i.e., above the head. The interior space is sufficiently large to provide enough room for a human head with hair. The outer contour of the interior space and the one 2024-INV-0017 -5- Virtual surfaces representing a human head with hair are therefore spaced apart from each other.

[0017] The light sources emit radiation in the range of > 230 nm to < 1000 nm, preferably in the range of > 380 nm to < 1000 nm. In particular, a range of > 380 nm to < 800 nm is suitable, for example, > 380 nm to < 780 nm. Furthermore, suitable ranges are those of > 380 nm to < 490 nm, especially in the range of > 390 nm to < 430 nm, and particularly in the range of > 400 nm to < 420 nm. For many applications, a range of > 380 nm to < 800 nm has proven suitable.

[0018] According to an embodiment described herein, an illumination device is used for the optical excitation of a photosensitizer contained in a bleaching agent to stimulate it to form singlet oxygen, wherein the bleaching agent comprises: (A) at least one first photosensitizer capable of generating singlet oxygen upon light excitation, (B) at least one persulfate salt, (C) at least one alkalizing agent, and (E) at least one hydrogen peroxide source.

[0019] Further embodiments, modifications, uses and advantages will become apparent to the person skilled in the art from the following detailed description. FIGURES

[0020] The accompanying drawings illustrate embodiments and, together with the description, serve to explain the principles of the solution described herein, without the embodiments being intended to restrict the scope of protection defined by the claims. The elements of the drawings are relative to each other and not necessarily to scale. Figure 1 shows a side view of a lighting device according to one embodiment. Figure 2 shows a top view of the lighting device from Figure 1. Figure 3 shows a lighting device to illustrate the arrangement of the light sources. Figure 4 shows a lighting device to illustrate the superposition of light cones from adjacent light sources. 2024-INV-0017 -6- Figure 5 shows a schematic view of an arrangement for evaluating the distribution of irradiance. Figures 6A to 6F show the distribution of irradiance in the virtual area as a function of the distance D between the light sources and the virtual area for the arrangement shown in Figure 5. Figure 7 shows another schematic view of an arrangement for evaluating the distribution of irradiance. Figures 8A and 8B show the distribution of irradiance in the virtual area as a function of the distance D between the light sources and the virtual area for the arrangement shown in Figure 7. Figure 9 shows the mean irradiance as a function of distance D for the arrangement shown in Figure 7. Figures 10A to 10C show another lighting device according to one embodiment. Figures 11A to 11G show another lighting device according to one embodiment. DETAILED DESCRIPTION

[0021] With reference to Figures 1 and 2, a lighting device 100 for head hair comprises a support device 110 with a plurality of light sources and a control device for controlling the light sources. The support device 110 defines an interior space 111 with a virtual outer contour 112, which delimits the interior space 111.

[0022] According to one embodiment, which can be combined with all embodiments described here, the support device 110 has at least two adjustable wing elements 113a, 113b, which are located on opposite sides of the head when the lighting device 100 is used as intended, and at least one head element 114a, 114b, which is located above or behind the head when the lighting device 100 is used as intended, wherein at 2024-INV-0017 -7- a multitude of light sources are distributed around each wing element 113a, 113b and on the head element 114a, 114b.

[0023] The support device 110 can be constructed in one piece or in multiple parts. The embodiment of a lighting device 100 shown in Figure 1 depicts a multi-part support device 110 with two lateral wing elements 113a, 113b and two centrally arranged head elements 114a and 114b. The wing elements 113a, 113b and the head elements 114a and 114b, which together are also simply referred to as elements, are individually attached to a curved support 117 of the support device 110, which is supported by a stand 115. Individual or all elements 113a, 113b, 114a and 114b can be movably attached to the support 117 in order to change the positions of the elements 113a, 113b, 114a and 114b relative to the support 117 or relative to the support device 110.

[0024] The inner surfaces of elements 113a, 113b, 114a, and 114b, specifically the light-emitting surfaces of the individual light sources, define the virtual outer contour 112 of the interior space 111. As shown in Figure 1, the interior space 111 is sufficiently large so that elements 113a, 113b, 114a, and 114b surround a human head with sufficient clearance. The wing elements 113a and 113b are attached to the support 117, for example, via a pivot joint 116. The pivot joint 116 allows, for example, lateral pivoting to vary the distance between the wing elements 113a and 113b (see Figure 2) and to adjust the height of the wing elements 113a. If the lighting device 100 has several spaced-apart elements 113a, 113b, 114a and 114b, the virtual outer contour 112 continues conceptually between the individual elements 113a, 113b, 114a and 114b.This is indicated in Figures 1 and 2 by the dashed line 112. The virtual outer contour 112 can thus be understood as a (curved) surface that connects the light-emitting surfaces of the individual light sources.

[0025] The rotary joint 116 can allow free rotation. Alternatively, it is possible for the rotary joint 116 to have a detent setting with predefined detents. It is also possible to switch between free rotation and rotation with predefined detents. The rotary joint 116 can, for example, allow pivoting in the lateral direction, in the vertical direction, and rotation along an axis extending longitudinally from the respective element 113a, 113b, 114a, and 114b.

[0026] The head elements 114a, 114b can also be attached to the support 117 via a swivel connection. Alternatively, the head elements 114a, 114b can be rigidly attached to the support 117. The support 117, which is connected to the stand 115, can have a height adjustment device to adjust the overall height of the support 110. 2024-INV-0017 -8- and adjust to the size of, for example, a seated person. Alternatively, the stand 115 can include a height adjustment device, or, as indicated in Figure 1, the support 117 and the stand 115 together can form a height adjustment device. The height adjustability of the support device 110 simultaneously changes the vertical position of all elements 113a, 113b, 114a, and 114b. Additionally, the wing elements 113a and 113b, for example, can be adjusted in height by pivoting them vertically. The wing elements 113a and 113b can therefore be pivoted both laterally and vertically.

[0027] Each of the elements 113a, 113b, 114a, and 114b can each have a plurality of light sources arranged on the respective surface of the elements 113a, 113b, 114a, and 114b facing the interior 111. The light sources of each of the elements 113a, 113b, 114a, and 114b are spaced apart from one another and radiate towards the interior 111. The radiation pattern of each light source can be described as a light cone, although this is not to be interpreted restrictively.

[0028] By changing the position of elements 113a, 113b, 114a, and 114b, the size of the interior space 111, and thus the virtual outer contour 112, can be adjusted. The support device 110, with the arrangement of elements 113a, 113b, 114a, and 114b, is dimensioned such that it is suitable for surrounding a human head at a distance. In particular, elements 113a, 113b, 114a, and 114b are spaced apart from a head located in the interior space 111.

[0029] The light sources are arranged and controllable by the control device in such a way that the light cones of adjacent light sources partially overlap in a virtual area spaced from the outer contour 112 and have an average irradiance (illuminance) of 5 to 70 mW / cm². 2 , especially 10 to 50 mW / cm² 2 and in particular 25 to 40 mW / cm² 2in the virtual area. The virtual area represents the contour of a human head, as can be seen, for example, in Figure 1. The position of the elements 113a, 113b, 114a and 114b can be adjusted, in particular, such that the virtual area has an average distance of 1 to 50 cm, in particular 5 to 50 cm, in particular 5 to 25 cm, for example 5 to 15 cm, from the outer contour 112.

[0030] The outer shape of an adult's head can be considered the virtual surface. The outer shape of the head can be understood as the enveloping surface that covers the head and hair. A medium-sized head shape can be assumed. Medium-sized heads are known from the clothing industry and are described, for example, by head circumference. A head circumference of 57 to 58 cm can be considered a medium size. The circumference resulting from the hair is then added to this head circumference. This can be calculated from a wet but... 2024-INV-0017 -9- It can be assumed that the hair is folded or laid on foil, as long hair is often folded during bleaching. The enveloping area is therefore larger than that of a head without hair. A specialist working in the relevant field can easily determine, if necessary by consulting stylists, the average size of the enveloping area and thus the average "volume" of the head. This average size, which defines the virtual area, is taken as the starting point for dimensioning the interior space 111, in particular as the starting point for the spacing of elements 113a, 113b, 114a, and 114b from the virtual area. Elements 113a, 113b, 114a, and 114b are then positioned, in particular, so that the light cones of adjacent light sources overlap sufficiently to achieve a largely uniform irradiance within the virtual area, and the irradiance is within the desired range.It is assumed that the head is located centrally in the interior space 111, i.e., with reference to the embodiment shown in Figures 1 and 2, the head is arranged centrally between the wing elements 113a, 113b and is approximately the same distance to the head elements 114a, 114b as to the wing elements 113a, 113b. The basic idea is that the irradiance acting on the surface of the head, which is represented by the virtual surface, is largely uniform.

[0031] The distance of the outer contour set by the selected position of elements 113a, 113b, 114a and 114b from the virtual surface is chosen in particular so that a person does not feel confined and can still move their head freely.

[0032] The virtual surface is curved according to the shape of the head. The arrangement of elements 113a, 113b, 114a, and 114b should follow the shape of the head. If separate and spaced elements 113a, 113b, 114a, and 114b are used, it is possible that the virtual surface (head shape) will not be uniformly illuminated. However, at least some areas of the virtual surface (head shape) will be illuminated largely evenly. By adjusting elements 113a, 113b, 114a, and 114b, overall uniform illumination can be achieved.

[0033] According to one embodiment, which can be combined with all embodiments described here, the position of the wing elements 113a, 113b and / or the head element(s) 114a, 114b is adjustable in detents. Optionally, when moving the elements 113a, 113b, 114a, and 114b into one of the detents, the intensity of the individual LEDs or all LEDs of the respective element 113a, 113b, 114a, and 114b can be simultaneously adjusted depending on the detents. Each detents can correspond to a predefined distance of the respective element 113a, 113b, 114a, and 114b from the virtual surface (head). To facilitate operation, a desired irradiance can be specified, and the current to the LEDs can be adjusted by the control device depending on the detents, so that regardless of the selected detents (position of the 2024-INV-0017 -10- the desired irradiance is achieved for each element 113a, 113b, 114a and 114b). For this purpose, the control device of all elements, or the control device of the respective element 113a, 113b, 114a and 114b, can be configured to query or record the current detent position of the element(s) 113a, 113b, 114a and 114b. For this purpose, transmitters, for example incremental encoders or absolute encoders, can be provided, which assign an output value to each detent position that can be queried or recorded by the control device.

[0034] The overlap of the light cones from adjacent light sources can be selected such that the irradiance in the virtual area fluctuates by only 1 to 30% around a mean value. A suitable range is 10 to 50 mW / cm² for the mean irradiance. 2 and in particular 25 to 40 mW / cm² 2 , for example 25 to 35 mW / cm² 2or 30 to 35 mW / cm² 2 or 30 to 40 mW / cm² 2The irradiance lies within the virtual area. Those skilled in the art are familiar with methods for determining the average irradiance, for example, by taking measurements at various points within the virtual area. The lateral distance between adjacent light sources can be chosen depending on the maximum radiant intensity of the light sources. A typical minimum lateral distance might be 5 cm, for example, if each light source has a collimator (lens device) for focusing or spreading the emitted light. Collimators (lens devices) can be used, for example, to spread the radiation emitted by the light sources, thus allowing for a greater lateral distance between the light sources compared to light sources without collimators. This ensures uniform irradiance even at a greater lateral distance. Without collimators (lens devices), the minimum lateral distance might be approximately 3 cm. The maximum lateral distance between adjacent light sources is not greater than 10 cm, in particular, to ensure uniform illumination. The values ​​mentioned above refer to light sources attached to elements 113a, 113b, 114a, and 114b.

[0035] The light sources emit particularly in a range of 380 nm to 800 nm and are oriented such that they each emit a cone of light directed towards the interior 111. Narrowband light sources are suitable, in particular LEDs, including conventional LEDs (inorganic semiconductors) and OLEDs (organic semiconductors). The light sources emit particularly with a bandwidth of no more than ± 35 nm, in particular no more than ± 25 nm, for example no more than ± 15 nm, and in particular no more than ± 10 nm around their nominal emission wavelength. When an emission wavelength is mentioned, the nominal emission wavelength, i.e., the one with the highest intensity, is meant. In the following, the light sources will be referred to simply as LEDs, without being limited to this. According to one embodiment, 2024-INV-0017 -11- especially LEDs with a spectral intensity distribution where the area of ​​highest intensity, i.e. the intensity range above 75% of the maximum intensity, has a spectral width of ± 25 nm.

[0036] Within the scope of this disclosure, the terms “electromagnetic radiation”, “radiation” and “light” are used synonymously and refer to the specified wavelength ranges.

[0037] Those skilled in the art know that the terms irradiance and illuminance physically describe the same thing: the power emitted per unit area (luminous flux). In radiology, the term irradiance is more commonly used, while in photometry, illuminance is preferred, as the radiant power is weighted according to the luminous efficacy curve of the human eye. To adjust the power emitted at the site of action for photoinduced chemical bleaching, i.e., the hair, it is possible to vary the radiant power of individual LEDs, change the number or spatial density of the LEDs, or adjust the distance between the LEDs and the virtual surface. Since the lighting device is used for the light-induced excitation of the photosensitizer, irradiance is the relevant term here.

[0038] If the spatial distribution of the LEDs is determined by their arrangement on the support device 110, the irradiance can be adjusted by modifying the radiant power via the control device 130 and / or the distance of the LEDs from the virtual surface. Furthermore, individual LEDs can be switched off to vary the spatial density of the active LEDs. The LEDs can be controlled all together, in groups, or individually. For example, LEDs located at the edge of the respective elements 113a, 113b, 114a, and 114b can be controlled separately from LEDs located further away from the edge to compensate for edge effects of the irradiation by the respective element 113a, 113b, 114a, and 114b. It is also possible to adjust the density of the spatial arrangement of the LEDs to reduce edge effects.

[0039] The groups can be accessed independently of each other in terms of location and / or time.

[0040] According to one embodiment, which can be combined with all embodiments described here, the LEDs are controlled in groups by the control device 130. The control device 130 is not shown in Figures 1 and 2. The control device 130 can be provided as a separate unit, but it can also be provided by several control devices, one for each element 113a, 113b, 114a, and 2024-INV-0017 -12- 114b, can be implemented. In the latter case, the respective control device can, for example, be integrated into the respective element 113a, 113b, 114a and 114b, thus enabling individual control of each element 113a, 113b, 114a and 114b.

[0041] According to one embodiment, which can be combined with all embodiments described herein, the LEDs (light sources) comprise first light sources with a first emission wavelength and second light sources with a second emission wavelength different from the first emission wavelength. For the sake of simplicity, the first light sources are referred to as first LEDs and the second light sources as second LEDs, without limitation.

[0042] For example, the first emission wavelength can be in the range of 380 nm to 450 nm, particularly in the range of 400 nm to 420 nm. If all LEDs have the same emission wavelength, then these ranges are suitable for all LEDs. The first LEDs, or in the case of the same emission wavelength, all LEDs, emit in a wavelength range suitable for exciting a photosensitizer. A preferred emission wavelength for exciting the photosensitizer is 405 nm. If the UV component is too high due to the emission bandwidth of the LEDs (or the first LEDs), LEDs with an emission wavelength of 415 nm can also be used.

[0043] According to one embodiment, which can be combined with all other embodiments described herein, the lighting device is used for bleaching hair, wherein a bleaching agent is applied to the hair. The bleaching agent comprises (A) at least a first photosensitizer capable of generating singlet oxygen upon light excitation, (B) at least one persulfate salt, (C) at least one alkalizing agent, and (E) at least one hydrogen peroxide source.

[0044] In the context of this disclosure, the term “photosensitizer” describes a compound that absorbs electromagnetic radiation, preferably visible light, UV light and / or infrared light, and generates singlet oxygen. According to one embodiment, which can be combined with all other embodiments described herein, the photosensitizer comprises at least one phenalenone. 2024-1 NV-0017 -13-

[0045] According to one embodiment, which can be combined with all other embodiments described herein, the bleaching agent comprises at least a second photosensitizer capable of generating singlet oxygen upon light excitation.

[0046] Phenalenones are known to generate singlet oxygen, see e.g. BJ Photochem. Photobiol. A: Chem, 79 (1994) 11-17 and New J. Chem., 1999, 23, 85-93.

[0047] In one embodiment, the phenalenones are unsubstituted phenalenone or unsubstituted phenalenones that are substituted, preferably in position 2 of the phenalenone ring, with at least one organic component that is substituted with at least one positively charged nitrogen atom and / or at least one neutral, protonable nitrogen atom and at least one negatively charged functional group.

[0048] According to one embodiment, which can be combined with all other embodiments described herein, the first photosensitizer is selected from the group consisting of phenalenones, turmeric, flavins, riboflavins, phenoxazines, phenothiazines, phthalocyanines, naphthalocyanines, xanthenes, chlorophyll A, chlorophyll B, porphyrins, coumarins, pyrenes, perylene, acridine orange, and tetrapyrroles. In addition to the first photosensitizer, the bleaching agent may also contain a second photosensitizer selected from the group consisting of turmeric, flavins, riboflavins, phenoxazines, phenothiazines, phthalocyanines, naphthalocyanines, xanthenes, chlorophyll A, chlorophyll B, porphyrins, coumarins, pyrenes, perylene, acridine orange, and tetrapyrroles. In particular, different first and second photosensitizers are used. For example, the first photosensitizer can be a phenalenone and the second photosensitizer can be selected from the group mentioned above.

[0049] Phenalenones are known to generate singlet oxygen, as described, for example, in J. Photochem. Photobiol. A: Chem, 79 (1994) 11-17 and New J. Chem., 1999, 23, 85-93.

[0050] In one embodiment, suitable flavins are disclosed in EP 2 723 342 A1, EP 2 723 743 A1, EP 2 723 742 A1 and US 2019 / 0111168 A1.

[0051] In one embodiment, suitable curcumins are disclosed in US 2019 / 0111168 A1. Suitable curcumin derivatives and their preparation are also described in CA 2 888 140 A1, and suitable curcumin-3,5-dione derivatives and their preparation are similarly described in EP 2 698 368 A1.

[0052] In one embodiment, the phenoxazine is preferably Nile blue. 2024-INV-0017 -14-

[0053] In one embodiment, the phenothiazines are preferably selected from the group consisting of methylene blue, toluidine blue, 1,9-dimethylmethylene blue and methylene green.

[0054] In one embodiment, the phthalocyanines are preferably selected from the group consisting of zinc phthalocyanine, aluminum phthalocyanine, zinc phthalocyanine tetrasulfonate and tetrakis(p-trimethylammonium)phthalocyanine zinc chloride.

[0055] In one embodiment, the xanthenes are preferably selected from the group consisting of pyronin G, eosin B, eosin Y and rose bengal.

[0056] In one embodiment, the porphyrins are preferably selected from the group consisting of 5,10,15,20-tetrakis(1-methyl-4-pyridinio)porphyrin-tetra(p-toluenesulfonate) and tetrakis(p-trimethylammoniumphenyl)porphyrin chloride.

[0057] In one embodiment, the tetrapyrroles are preferably selected from the group consisting of chlorin, chlorin e6 and bacteriochlorin.

[0058] In one embodiment, the at least one phenalenone (A) preferably generates singlet oxygen when exposed to electromagnetic radiation with a wavelength in the range of > 230 nm to < 1000 nm, particularly in the range of > 380 nm to < 1000 nm, particularly in the range of > 380 nm to < 780 nm, particularly in the range of > 380 nm to < 490 nm, particularly in the range of > 390 nm to < 430 nm, and particularly in the range of > 400 nm to < 420 nm. The most suitable wavelength for the photosensitizer to generate singlet oxygen is selected based on the specific chemical nature of the photosensitizer.

[0059] In one embodiment, the at least one phenalenone (A) is preferably dissolved in at least one polar solvent before being mixed with the other components of the bleaching agent.

[0060] The bleaching agent contains a persulfate salt (B). In one embodiment, the at least one persulfate salt (B) is selected from the group consisting of alkaline earth metal persulfate salts, alkali metal persulfate salts, and ammonium persulfate salts, which exhibit oxidizing activity, i.e., generate active oxygen, when combined with an aqueous composition comprising hydrogen peroxide. Examples of alkali metal persulfate salts are lithium persulfate, sodium persulfate, potassium persulfate, and cesium persulfate. Examples of alkaline earth metal salts are magnesium persulfate and calcium persulfate. In one embodiment, the at least one persulfate salt (B) is preferably selected from the group consisting of ammonium persulfate, sodium persulfate, and 2024-INV-0017 -15- Potassium persulfate is present. The persulfate salts are generally in particle form and have an average particle size ranging from > 0.1 pm to < 200 pm.

[0061] In a preferred embodiment, the at least one alkalizing agent (C) is selected from the group consisting of ammonia, alkanolamines, and inorganic alkalizing agents. In a preferred embodiment, the alkanolamines are selected from primary amines having a C2-C6 alkyl base bearing at least one hydroxyl group. Preferred alkanolamines are selected from the group consisting of monoethanolamine, 3-aminopropan-1-ol, 2-amino-1-propanol, 4-aminobutan-1-ol, 5-aminopentan-1-ol, 1-aminopropan-2-ol, 1-aminobutan-2-ol, 1-aminopentan-2-ol, 1-aminopentan-3-ol, 1-aminopentan-4-ol, 3-amino-2-methylpropan-1-ol, 1-amino-2-methylpropan-2-ol, 3-aminopropan-1,2-diol and 2-amino-2-methylpropan-1,3-diol.

[0062] In one embodiment, the bleaching agent preferably comprises at least one additive (D) selected from the group consisting of sources of carbonate ions or hydrogen carbonate ions or carbamates, aluminosilicates, surfactants, chelating agents, thickeners, fillers, amino acids, hydrolyzed proteins, fatty substances, saturated acyclic terpenes with 10 to 40 carbon atoms, C3-C20 monocarboxylic acids and C3-C10 di- or tricarboxylic acids.

[0063] Further preferred photosensitizers, persulfates and alkalizing agents, as well as preferred combinations, concentrations and further components are contained in WO 2024 / 246147 A 1 (with priority of EP application 23 177 117.1 of the applicant dated 02.06.2023), the full disclosure of which is hereby incorporated.

[0064] As demonstrated in the examples of WO 2024 / 246147 A1, a photosensitizer enables improved bleaching without causing additional damage to the hair. Specifically, the examples in WO 2024 / 246147 A1 showed that using a photosensitizer in a bleaching agent allows for stronger bleaching without causing additional damage. The bleaching strength was determined photometrically (expressed as AL in the examples of WO 2024 / 246147), and the hair damage was determined by Fourier-transform infrared spectroscopy (FTIR spectroscopy) and expressed as AFTIR. It is therefore also possible to bleach hair more gently while achieving the same bleaching strength.

[0065] The results of WO 2024 / 246147 also show that no additional hair damage was observed after irradiation with an irradiance in the preferred range. The experiments in WO 2024 / 246147 were conducted with a light source emitting at 415 nm and an irradiance of 35 mW / cm². 2 carried out. 2024-INV-0017 -16-

[0066] As explained above, the LEDs, or the first LEDs, serve to excite the photosensitizer. However, irradiation by the first LEDs does not lead to physical bleaching of the hair through direct action of the radiation emitted by the first LEDs. This is where the present approach, in which the radiation excites the first and / or second photosensitizer, differs from previously known irradiation devices in which the incident radiation directly leads to bleaching. For example, in the aforementioned EP 3 137 171 B1, in Example 1 ("Example 1 - bleaching", paragraphs

[0134] until

[0136] ) explains that the hair is exposed to an irradiance of 751 mW / cm² 2 The sample was irradiated for 15 minutes at 365 nm. In the other examples in EP 3 137 171 B1, an irradiance between 400 and 1200 mW / cm² was used. 2 worked (see example, table in paragraph)

[0176] ). Such high High levels of radiation lead to physical bleaching with corresponding damage to the hair.

[0067] In contrast, the lighting device described here only uses an irradiance of 5 to 70 mW / cm². 2 , especially 10 to 50 mW / cm² 2 and especially 25-40 mW / cm² 2 This method is designed so that only the photosensitizer is stimulated, without any physical bleaching of the hair. When using the lighting device described here, bleaching occurs chemically. The exposure serves only to stimulate the photosensitizer. Therefore, a significantly lower irradiance can be used, thus reducing hair damage. Furthermore, the radiation exposure of the person's scalp is reduced.

[0068] Furthermore, the thermal stress from LED irradiation on the head is still tolerable at the desired irradiation intensity. This is not the case with EP 3 137 171 B1. Therefore, individual strands of hair must be treated there as well.

[0069] Since the lighting device described here is intended only to stimulate the photosensitizer, the entire volume of hair does not necessarily need to be exposed uniformly. In the case of EP 3 137 171 B1, individual strands of hair must be irradiated with a light source positioned very close to the respective strand to achieve the desired effect, as otherwise deeper hair would not receive sufficient irradiance. This is not necessary with the lighting device described here, since only the photosensitizer is stimulated, and diffusion processes allow the photosensitizer to reach even deeper hair. Light-assisted bleaching of the entire head is also simpler with the lighting device described here than the strand-by-strand exposure required by EP 3 137 171 B1. 2024-INV-0017 -17-

[0070] According to one embodiment, which can be combined with all other embodiments described herein, the first emission wavelength differs from the second emission wavelength by at least 100 nm, in particular by at least 200 nm.

[0071] According to one embodiment, which can be combined with all other embodiments described herein, the first emission wavelength differs from the second emission wavelength by a maximum of 600 nm, in particular by a maximum of 400 nm. The second emission wavelength can therefore differ from the first emission wavelength by at least 100 nm and at most 600 nm, by at least 100 nm and at most 400 nm, by at least 200 nm and at most 600 nm, or by at least 200 nm and at most 400 nm. The second emission wavelength can be longer than the first emission wavelength.

[0072] According to one embodiment, which can be combined with all other embodiments described herein, the second light sources emit in a range above 450 nm, in particular above 500 nm, and especially above 550 nm.

[0073] The second set of LEDs emits longer wavelength radiation (light) compared to the first set and can be used for wellness applications, such as creating a pleasant light tone or emitting warming radiation. These second LEDs can emit in the red and near-infrared range, for example, in a range between 650 nm and 900 nm.

[0074] According to one embodiment, the first emission wavelength is in a range of 380 nm to 450 nm, in particular from 380 nm to 450 nm, and in particular from 400 nm to 420 nm, and the second emission wavelength is in a range above 500 nm, and in particular above 550 nm, for example in a range between 600 nm and 900 nm.

[0075] The arrangement of the LEDs is explained in more detail with reference to Figures 3 and 4. Figure 3 shows an arrangement of LEDs according to an embodiment in which first and second LEDs are used. The first LEDs 210a, 210b, 210c emit light with a first wavelength, for example, 405 nm or 415 nm. The second LEDs 220a, 220b, 220c emit light with a second wavelength, for example, 600 nm or 650 nm. LEDs capable of emitting light at different wavelengths can also be used. By appropriately controlling the LEDs, the desired first or second wavelength can then be selected. It is thus possible to use identical LEDs for the first and second LEDs, whereby the control mechanism allows for the division into first and second LEDs. 2024-INV-0017 -18- The first LEDs (210a, 210b, 210c) emit light with a first wavelength, while the second LEDs (220a, 220b, 220c) emit light with a second wavelength. This allows the ratio of the first LEDs (210a, 210b, 210c) to the second LEDs (220a, 220b, 220c) to be dynamically adjusted by the control signal.

[0076] For example, LEDs can be used that emit light with a wavelength of 405 nm or 415 nm, depending on the control signal. It is also possible to combine two or more LEDs with different wavelengths into a single LED base unit, with each base unit representing a light source with a variable wavelength. By controlling each base unit, the intensity and wavelength of each base unit (light source) can be individually adjusted. Multiple base units can be grouped together as described above.

[0077] It is also possible to use first LEDs that emit light at a first wavelength, second LEDs that emit light at a second wavelength, and third LEDs that emit light at a third wavelength, where the first, second, and third wavelengths are different. In this case as well, LEDs that can emit light at different wavelengths depending on their control signal can be used.

[0078] Both the first LEDs 210a, 210b, 210c and the second LEDs 220a, 220b, 220c are arranged in groups or zones, namely in a first lighting zone (group) 210a or 220a, which runs in a ring shape around the outer edge of the lighting device 200, in a third lighting zone (group) 210c or 220c, which is located in the inner area of ​​the lighting device 200, and a second lighting zone (group) 210b or 220b, which runs in a ring shape around the third lighting zone 210c or 220c and is arranged between the third lighting zone 210c or 220c and the first lighting zone 210a or 220a. The LEDs of the first lighting zone 210a and 220a are drawn as squares, the LEDs of the second lighting zone 210b and 220b are drawn as hexagons, and the LEDs of the third lighting zone 210c and 220c are drawn as circles. For clarity, the first and second LEDs are shown with different hatching patterns.

[0079] The lighting device 200 shown in Figure 3 can, for example, represent one of the elements 113a, 113b, 114a, 114b. The first LEDs 210a, 210b, 210c and the second LEDs 220a, 220b, 220c can be controlled independently of one another by the control device. The control device is not shown in Figure 3. Additionally, the individual groups (lighting zones) can be controlled independently of one another. In the embodiment shown in Figure 3, there are therefore a total of six groups of LEDs that can be individually controlled. 2024-INV-0017 -19-

[0080] In the embodiment shown in Figures 1 and 2, it is advantageous to increase the density of the light sources at the periphery compared to the center, to supply the light sources at the periphery with a stronger current (i.e., to control them more strongly via the control device), and / or to select a slightly different emission direction compared to the light sources in the center. This allows areas of the head that are not directly covered by the respective elements 113a, 113b, 114a, and 114b to be illuminated by appropriate alignment and control of the light sources. Thus, the intermediate area can also be illuminated. Figure 1, for example, indicates that the head elements 114a and 114b illuminate an area larger than their lateral dimensions. The area irradiated by the respective element 113a, 113b, 114a, 114b may partially overlap with an area irradiated by a neighboring element 113a, 113b, 114a, 114b.For example, it is possible to increase the density of the light sources, i.e., to reduce their lateral spacing compared to the light sources in the middle and to make the outer light sources shine slightly outwards. This can be combined with controlling them in groups (zones).

[0081] Figure 4 shows a lighting device according to one embodiment to illustrate the superposition of the light cones 312, 323, 332 of adjacent LEDs 310, 320, 330. The light cones 312, 322, 332 are shown with dotted lines, the respective optical axis 313, 323, 333 of the individual LEDs 310, 320, 330 is shown with dashed lines, and the virtual surface 360, which represents the outer shape of a head, is shown with dashed lines.

[0082] The LEDs 310, 320, and 330 are arranged on a support device 350, in this case with equal lateral spacing. However, the lateral spacing can also vary. For example, the lateral distance can decrease towards the edge of the lighting device 300. The LEDs 310, 320, and 330 can be individually controlled via a control device 340, as shown in Figure 4. Each LED 310, 320, or 330 can also represent a group of LEDs, as shown, for example, in Figure 3.

[0083] Each LED 310, 320, 330 can be equipped with a lens device (collimator) 311, 321, 331 to focus the emitted radiation and form more tightly focused light cones 312, 322, 332. The lateral spacing (distance between adjacent LEDs) of the individual LEDs 310, 320, 330 is chosen such that the light cones 312, 322, 332 of adjacent LEDs 310, 320, 330 overlap in the virtual area 360. The LEDs 310, 320, 330 can also have different lens devices, for example, with different degrees of light focusing, in order to compensate for edge effects.

[0084] By using the lens devices 311, 321, 331, it is possible to position the LEDs at a greater distance from the virtual surface (head surface). Likewise, it is possible to use the lens devices 311, 321, 331 to focus the respective light cone 312, 322, 332. 2024-INV-0017 -20- to widen further in order to achieve a uniform irradiance even at shorter distances.

[0085] Figure 5 shows a schematic view of an arrangement for evaluating the irradiance distribution. For this purpose, LEDs 530 are arranged in a plane 500, which here represents the outer contour. The LEDs 530 are arranged in a grid, with the LEDs 530 being closer together at the left and right edges. This is advantageous, for example, for elements 113a, 113b, 114a, and 114b. The irradiance was then determined for various virtual surfaces 510 and 520, which are located at a predefined distance D from the outer contour.

[0086] LEDs are used as Lambertian emitters with a rectangular base area of A size of 1 mm x 1 mm is assumed. The virtual areas 510 and 520 shown are assumed to be detector areas and correspond in size to the extent of the LED grid shown (plus one LED spacing). The detector areas, i.e., the virtual areas 510 and 520, are assumed to be at different distances from the LED grid, with distances D from 0 mm to 100 mm in 5 mm increments.

[0087] The simulated results are given as irradiance distributions in W / mm². 2 shown on the respective detector surface, i.e. the virtual surface placed at a certain distance D, with the results slightly smoothed.

[0088] Figures 6A to 6F show simulations of the irradiance as a function of the distance D of a virtual surface 510, 520 from the lighting device (in plane 500). The distance D is shown above the illustration in each case and is 5 mm (Figure 6A), 30 mm (Figure 6B), 45 mm (Figure 6C), 55 mm (Figure 6D), 70 mm (Figure 6E), and 85 mm (Figure 6F). As can be seen in Figure 6A, the spatial density of the LEDs is higher at both the right and left edges. However, it is also possible to choose a uniform spatial distribution of the LEDs. The lateral spacing of the LEDs in the center was approximately 50 mm.

[0089] At a distance D of 5 mm (Figure 6A), the exposure is still strongly point-like. The light cones do not yet overlap.

[0090] At a distance D of 30 mm (Figure 6B) the light cones already overlap, but the spatial distribution of the irradiance is still uneven.

[0091] At a distance D of 45 mm (Figure 6D), a very uniform distribution of irradiance is already achieved, which improves further with increasing distance D. At 70 mm (Figure 6E), a homogeneous distribution of irradiance is visible in the central area. By appropriately controlling the LEDs, this homogeneous distribution can also be extended to the edge of the area. 2024-INV-0017 -21-

[0092] The color and gray values ​​shown in Figures 6A to 6F have been rescaled for each figure and therefore do not allow a direct absolute comparison between them. The scale value is always indicated on the right. The irradiance profile along the vertical line is also shown there. In Figures 6A and 6B, a distinctly wavy profile is still visible; that is, the distribution of the underlying LED grid is still recognizable up to a distance D of 30 mm. In Figures 60 to 6F, the profile is already significantly more homogeneous. However, the irradiance gradually decreases with increasing distance D. Furthermore, the edge falloff increases with increasing distance D. If the 530 LEDs are arranged closer together, a uniform distribution is achieved even at distances of less than 30 mm. To prevent excessive irradiation, the 530 LEDs can be supplied with a correspondingly lower current to reduce their emission intensity.

[0093] The following irradiance values ​​were determined at the location of the crosshairs shown in Figures 6A to 6F and are listed in Table 1. The crosshairs are positioned at the projection point of an LED 530 on the virtual surface. It can be seen that a very high irradiance is still present at a distance D of 5 mm. At distances D of 20 mm and 25 mm, the irradiance is already in a range where damage is only conditionally likely, even though at these distances D, with the lateral spacing of the LEDs 530 chosen here, the irradiance is still very uneven (see Figure 6B for distance D = 30 mm). 2024-1 NV-0017 -22- Table 1

[0094] The control device 340 is used, in particular, to adjust the average current supplied to the individual LEDs 310, 320, 330. Pulse-width modulation of the current can be used for this control.

[0095] To verify the above simulation, an illumination device with LTPL-C034UVH405 LEDs and an emission wavelength of 405 nm was used. The maximum optical output power per LED was approximately 1000 mW. It was confirmed that at distances D of 1 to 70 cm, particularly at distances D of 3 to 25 cm, and especially at distances D of 3 to 15 cm, a sufficiently uniform irradiance distribution can be achieved, which is sufficient to excite a photosensitizer to form singlet oxygen.

[0096] The following radiometric considerations can be used as a basis for the arrangement of the LEDs.

[0097] A flat, square grid of LEDs with spacing a (without limiting the size of the grid, i.e., without considering edge effects) and an LED output flux (power) P produces an average radiant intensity E of E = P / a2 . 2024-INV-0017 -23-

[0098] The target irradiance E should be 50 mW / cm² 2 Assuming a power output of P = 1000 mW for each LED, this results in... a lateral distance a between adjacent LEDs of a = 45 mm, or 20 cm 2 Area per LED.

[0099] In this idealized case, the irradiance at a distance D from the LEDs (approximately 1.2 * a) no longer depends on the lateral distance from the LEDs. The light at a point on the detector (virtual area) is simply composed of contributions from an increasing number of LEDs, with the individual contribution of each LED decreasing with distance D.

[0100] However, with a limited size of the LED grid, a distance-dependent loss of light intensity and edge falloff must be expected, as already seen in connection with Figures 5 and 6A to 6F. Therefore, the LED spacing can preferably be set smaller.

[0101] Figures 7, 8A and 8B illustrate a simulation based on this.

[0102] Figure 7 shows another schematic view of an arrangement for evaluating the irradiance distribution. LEDs 730 are arranged in a plane 700, which here represents the outer contour. The LEDs 730 are arranged in a regular 7x7 grid. The virtual surfaces 720 and 740 are positioned at a distance D from the outer contour, with their area being smaller than that of the outer contour. This avoids edge effects during the evaluation. The perpendicular projection 710 of the virtual surfaces 720 and 740 onto the plane 700 is shown as a dotted line.

[0103] For the irradiance distribution shown in Figures 8A and 8B, the 7 x 7 LEDs were assumed to be spaced 35 mm apart laterally. This placed one LED in the center.

[0104] The detector size corresponds to the size of the virtual areas 720, 740 shown in Figure 7, each of which has a size corresponding to a square with a side length of 3 LED spacings, i.e. 105 mm x 105 mm.

[0105] Figure 8A shows the irradiance distribution for two virtual surfaces spaced at a distance of D = 30 mm and D = 50 mm, respectively. Simulations showed that a sufficiently homogeneous distribution is already present at a distance of 30 mm, becoming even more uniform with increasing distance D. The profile along the vertical line is 2024-INV-0017 -24- shown on the right. The irradiance varied slightly in each virtual plane. The areas are shown in Table 2. Table 2

[0106] The target value is 50 mW / cm² 2 Irradiance was still achieved even at a distance D = 100 mm, but with a lateral spacing of 35 mm between the LEDs instead of the ideally calculated 45 mm. Therefore, it is more advantageous to set the lateral spacing of adjacent LEDs slightly smaller than the ideal spacing a. The lateral spacing of adjacent LEDs can thus be, for example, between 0.7 * a and 0.9 * a. By specifying the radiant intensity (power) P of the LEDs and the desired irradiance E, the preferred average lateral spacing a can be determined. If a lower irradiance is desired, e.g., 30 mW / cm², the lateral spacing can be adjusted accordingly. 2This can then be achieved by appropriately adjusting the control of the LEDs, without requiring any changes to the spatial distribution of the LEDs. Thus, in the example above, an irradiance of, for example, 30 mW / cm² can also be selected. 2 or 50 mW / cm² 2 This can be achieved at a distance D of, for example, 20 cm, by controlling the LEDs accordingly, for example by controlling the current using pulse width modulation via the control device.

[0107] Figure 9 shows the mean irradiance E (avg .) of the simulation as a function of the distance D, where the extent of the virtual area is 105 mm x 105 mm, as assumed in the preceding simulation.

[0108] A lighting device according to a further embodiment is explained with reference to Figures 10A to 10C, wherein Figure 10A shows a 3-dimensional overall view, Figure 10B shows a 3-dimensional sectional view, and Figure 10C shows a modification. 2024-INV-0017 -25-

[0109] The lighting device 900 comprises a support device 910, which is designed in a hood-like or bowl-like shape. As shown in Figure 10A, the support device 910 comprises a plurality of curved first webs 911 extending radially from a central point 913. If the support device 910 is viewed as a downwardly open hemispherical shell, then the central point 913 is located above the head 950 indicated in Figure 10A. The first webs 911 extend laterally and downwardly from the central point 913, curving around approximately the upper half of the head 950.

[0110] Second ribs 912 run around the head, here formed in the form of concentric rings 912, with the ring with the largest diameter located at the lower end of the first ribs 911. From the lower end of the first ribs 911 towards the center point 913, the diameter of the rings 912 decreases.

[0111] The support structure 910, composed of radially arranged arcuate first struts 911 and annular second struts 912 intersecting the first struts 911, creates a curved network to which the LEDs (light sources) 920 can be attached. Since, when the illumination direction is used as intended, the center point 913 is at the top and the support structure 910 is curved downwards, the first struts 911 can also be referred to as meridians (circles of longitude) and the second struts 912 as parallels. The support structure 910 therefore generally has the form of an approximately hemispherical network.

[0112] The shape does not have to be strictly hemispherical. It is also possible to design the support device 910 with a more oval shape.

[0113] The bending radius of the first webs 911 is selected such that the support device 910 extends around the head 950 at a distance from each other. A plurality of LEDs 920 are arranged on the inside of the first and second webs 911, 912, radiating towards the interior of the hemispherical support device 910. The curved surface defined by the LEDs 920 represents, as already explained, the outer contour of the interior. In the embodiment shown here, the individual LEDs 920 are attached to the second webs (rings) 912, but not to the first webs 911, so that the lighting device 900 has groups of ring-shaped LEDs 920. However, the LEDs 920 can also be arranged on the first webs 911 or on the first webs 911 and the rings 912.

[0114] The LEDs 920 can be arranged so that the lateral distance between adjacent LEDs 920 is approximately the same. However, it is also possible to vary the lateral distances. For example, the lateral distances of the LEDs in the area of ​​the back of the head and in the upper area, i.e., towards the center 913, can be smaller than in the area of ​​the front of the head. 2024-INV-0017 -26- to reduce the strain on the facial area caused by the radiation emitted by the LEDs 920.

[0115] As explained above in connection with Figures 3 and 4, LEDs 920 emitting light of different wavelengths can be used. The explanations given in connection with Figures 3, 4, 5, 6A to 6F, 7 and 8A to 8B also apply analogously to the LEDs 920 of the lighting device 900.

[0116] The optical axis of the LEDs 920, which is not shown in Figures 10A to 10C, is essentially oriented perpendicular to the outer contour, so that the LEDs 920 shine perpendicularly onto the virtual plane, which is represented here by the schematically indicated head.

[0117] Figure 10C schematically shows an extension 915 of the support device 910. The support device 910 can extend further downwards in the area of ​​the back of the head and neck, creating a lighting device 900 that completely surrounds the upper part of the head 950 and only the lateral and posterior areas of the lower part of the head 950. No support device is arranged in the area of ​​the face.

[0118] The extension 915 can be formed by lengthening some of the first bridges 911 and by adding partial rings (not shown) connected to the extended first bridges 911. LEDs can be attached to the partial rings, to the extended first bridges 911, or to both. This modification makes it possible to illuminate even long hair.

[0119] The irradiation device 100, 900 can be used for the optical excitation of a photosensitizer contained in a bleaching agent to stimulate it to form singlet oxygen for bleaching hair. The bleaching agent comprises (A) at least one first photosensitizer capable of generating singlet oxygen upon light excitation, (B) at least one persulfate salt, (C) at least one alkalizing agent, and (E) at least one hydrogen peroxide source. The bleaching agent is applied to the hair and then irradiated using the irradiation device 100, 900, for example, for a period of 1 min to 60 min, in particular 3 min to 40 min, and in particular 5 min to 30 min. It is also possible to select shorter or longer irradiation times, for example 1 min to 15 min, 3 min to 20 min, or 10 min to 60 min.

[0120] Further details regarding preferred photosensitizers and the bleaching agent are explained above. Reference is also made to WO 2024 / 246147 A1, mentioned above, the full disclosure of which is hereby incorporated. 2024-INV-0017 -27-

[0121] For longer hair, individual strands can be placed on foils, and then the bleaching agent applied to the strands. The foils support the hair strands and make it easier to treat them individually. For irradiation, the foils can be folded over the hair, especially if it is longer. This increases the "volume" of the head, i.e., the area covered. This increase in "volume" can also be taken into account when sizing the 100, 900 light fixture, as explained above.

[0122] The films used are primarily translucent, especially those that allow visible light to pass through. This allows the light emitted by the LEDs to reach deeper strands of hair, resulting in even bleaching.

[0123] With reference to Figures 11A to 11G, a lighting device 1100 according to a further embodiment is shown. Here, the terms "top," "bottom," "front," "back," "side," etc., are used in their normal meanings, with "back" referring to the side to which the support device is attached to a stand. The opposite side is the front side, or simply "front."

[0124] The lighting device 1100 according to Figures 11A to 11G has a support device 1110, which is essentially bowl-shaped or helmet-shaped and can almost completely surround a human head, leaving the face uncovered. The support device 1110 is height-adjustable and attached to a stand 1115. At its lower end, the stand 1115 has a frame 1120 with casters to allow the entire device to be moved easily.

[0125] The stand 1115 further comprises a telescopic column 1122, which carries a holding device 1105 at its upper end. The holding device 1105, in turn, carries the support device 1110, which can be arranged to be horizontally displaceable on the holding device 1105 via an arm 1106. The height of the support device 1110 can be adjusted via the telescopic column 1112. This can be done manually or by means of a lifting device (not shown in detail here). For this purpose, the stand 1115 can have operating elements 1123, for example pushbuttons, by means of which predefined height settings or any desired height settings can be controlled by a motor. This is shown in Figure 11G.

[0126] The control device can be housed in the holding device 1105 or in the support device 1110. The control device is therefore not visible in Figures 11A to 11G. 2024-INV-0017 -28-

[0127] The lighting device 1100 is designed to have a closed outer form. In particular, the support device 1110 can have a head element 1114 and two wing elements 1113 arranged on the head element 1114. The head element 1114 and the two wing elements 1113 together form a closed outer form, with the two wing elements 1113 in particular defining a lower access opening 1116 to the interior 1111.

[0128] The head element 1114 can have the form of a shell open downwards, i.e., towards the interior 1111. Additionally, the head element 1114 can have a downwardly extending fastening section 1118 on its rear side, i.e., towards the stand 1115, which extends downwards over the edge of the "shell".

[0129] The fastening section 1118 can, for example, be used to fasten the support structure 1110 to the stand 1115.

[0130] In particular, the mounting section 1118 of the head element 1114 can be connected to the holding device 1105. For example, the mounting section 1118 of the head element 1114 can be rigidly connected to the arm 1106. The arm 1106 extends from the outside of the mounting section 1118 of the head element 1110 towards the holding device 1105 and is mounted in the holding device 1105 so as to be horizontally displaceable. The holding device 1105 can have operating elements 1107 by means of which a horizontal displacement of the arm 1106 relative to the holding device 1105 can be effected, for example by controlling an actuator. This facilitates handling by the user.

[0131] The wing elements 1113 can be pivotally arranged on the head element 1114. When the lighting device 1110 is used as intended, the head element 1114 surrounds, in particular, the upper part of the head. When the lighting device 1110 is used as intended, the two wing elements 1113 are located on opposite sides of the head. By pivoting the wing elements 1113 laterally, the clear width of the access opening 1116 can be increased, thus facilitating access to the interior 1111. Furthermore, the customer undergoing cosmetic treatment with the lighting device 1110 does not feel as if they have to put their head through an excessively narrow access opening. This improves customer acceptance. In addition, the pivotable wing elements 1113 facilitate cleaning of the interior 1111 after use. 2024-INV-0017 -29-

[0132] As already explained in connection with Figure 10C, the support device 1110 of the lighting device 1100 can further comprise an extension 1160, which can be arranged, for example, at a rear lower end of the head element 1113. The extension 1160 can be removably arranged on the head element 1113, for example, by means of a magnetic holder 1161. For this purpose, magnets can be provided on the head element 1113 and / or on the extension 1160, which enable secure attachment and alignment of the extension 1160 on the head element 1113.

[0133] In particular, the fastening section 1118 of the head element 1114 can have a fastening interface 1117 at its lower end, to which the extension 1160 can be detachably attached with its fastening interface 1163. Figure 11E shows the extension 1160 removed from the head element 1113 of the support device 1110.

[0134] The mounting interface 1163 of the extension 1160 can have magnets 1161 which interact with magnets (not shown) of the mounting interface 1117 of the mounting section 1118 and securely hold the extension 1160 on the head element 1114. Furthermore, the mounting interface 1163 of the extension 1160 can have electrical contacts 1161, for example pins, which make contact with corresponding electrical contacts of the mounting interface 1117 of the extension 1160.

[0135] The wing elements 1113 can, for example, be pivotably mounted on the fastening section 1118, in particular on each side edge 1119 of the fastening section 1118.

[0136] The wing elements 1113 can be pivoted outwards, in particular to the side. Each wing element 1113 can be pivoted outwards individually. As can be seen, for example, in Figures 11A, 11B and 11F, each wing element 1113 tapers towards its front end. This ensures that the customer's view "outwards" is not obstructed. At the same time, it ensures that the wing elements 1113 extend further downwards in the side area, thereby allowing illumination of the head and hair.

[0137] The ability to open the wing elements 1113 outwards improves both customer access to the interior 1111 and facilitates cleaning. Furthermore, the wing elements 1113 allow the user, such as a stylist, easier access to the customer's head and hair during a treatment, for example, to manipulate specific sections of hair, apply a cosmetic product, or simply monitor the progress of the treatment. This prevents... 2024-INV-0017 -30- that the lighting device 1100 would have to be removed, which would interrupt the cosmetic treatment and lead to longer treatment times.

[0138] The enclosed helmet or hood shape of the lighting device ensures even illumination and a controlled environment inside the 1111. Furthermore, the enclosed design facilitates cleaning.

[0139] The two wing elements 1113 and the head element 1114 each have an inner surface which together define and surround the interior space 1111, particularly when the two wing elements 1113 are closed. The inner surfaces can merge almost seamlessly into one another. This can also apply to the extension 1160, i.e., its inner surface also defines and surrounds the interior space 1111.

[0140] The head element 1114 and the two wing elements 1113 each have a plurality of LEDs 1130 (light sources), as shown in Figure 11F, whereby, as already described above, the arrangement and type of the light sources can vary. For example, it is possible that LEDs for emitting light in different wavelength ranges (first and second light sources) are arranged in patterns in both the head element 1114 and the two wing elements 1113. If the lighting device 1110 has the extension 1160, it can also have LEDs.

[0141] Figure 11C shows a section along a sagittal plane of the lighting device 1100, and Figure 11D shows a section along a frontal plane of the lighting device 1100. The sagittal plane divides the lighting device 1100, viewed from the front, into a right and left half. In contrast, the frontal plane divides the lighting device 1100 into a front and a back half. In these sectional views, it can be seen that the lighting device 1100 is designed to surround a human head 1150 such that the head 1150 is spaced approximately equidistant from the outer contour 1112 of the interior space 1111. Figures 11C and 11D indicate the front distance Dv, the rear distance Dh, the upper distance Do, and the lateral distances Ds of the head 1150 from the outer contour 1112 of the interior 1111. The head surface is considered the virtual surface here.

[0142] The front distance Dv, the rear distance Dh, the top distance Do, and the lateral distances Ds are specific values ​​of the distance D and lie approximately in the same range, although they may differ slightly. For example, the lateral distances Ds may be somewhat larger than the top distance Do, since a small lateral distance, in particular, can be perceived as restrictive by the person in question. To prevent different distances from leading to uneven exposure, the LEDs (not shown in Figures 11C and 11D) can be positioned differently by the 2024-INV-0017 -31- Control device activated to counteract uneven exposure.

[0143] In the lighting device 1100 shown in Figures 11C and 11D, a head 1150 with a head circumference of 58 cm is depicted. The upper distance Do between the outer contour 1112 and the scalp can be, for example, between 10 and 15 cm, for example, 11.5 cm. The lateral distances Ds, which here are taken between the respective ear and the outer contour, can also be, for example, between 10 and 15 cm, for example, 13.5 cm. Accordingly, the anterior distance Dv and the posterior distance Dh can each also be, for example, between 10 and 15 cm, for example, 12.8 cm each. The posterior distance Dh is measured from the point of the head 1150 projecting furthest to the rear, while the anterior distance Dv is measured from the forehead area immediately above the eyes.

[0144] The interior space 1111 can therefore have an approximately semi-spherical outer contour 1112. The outer contour 1112 can have a mean diameter, measured at a mean height, of, for example, between 42 and 50 cm.

[0145] In Figures 11C and 11D, the LEDs are not shown separately. However, as explained above in connection with Figures 3 to 5, 6A to 6F, 7, 8A, 8B and 9, they can be arranged and controlled accordingly.

[0146] Figure 11H illustrates once again that the LEDs can be controlled in groups. For this purpose, the LEDs 1130 are divided into group A and group B. The LEDs 1130 of group A are, for example, located in the area of ​​the extension 1160, while the LEDs 1130 of group B are located in the area of ​​the head element 1114 and the wing elements 1113. In Figure 11H, the LEDs of group A are off, while those of group B are on. If, for example, a customer has short hair, then only the LEDs 1130 of group B (head element 1114 and wing elements 1113) need to be activated, but not the LEDs 1130 of group A (extension 1160). This reduces light exposure and energy consumption, resulting in less heat generation inside the interior 1111.

[0147] Basically, the LEDs 1130 can be divided into any group, for example the LEDs in the head element 114 can form a group, the LEDs of each wing element 1113 can form a group, and the LEDs 1130 of the extension 1160 can also form a group, so that there are at least four groups of LEDs in total.

[0148] Each of these elements can also have two groups of LEDs, for example, one group of the first LEDs mentioned above and one group of the LEDs mentioned above. 2024-INV-0017 -32- the second LEDs mentioned. The groups can be arranged in patterns that interpenetrate each other, so that, for example, LEDs from the two groups alternate. The spatial density of LEDs in the two groups can be the same or different. For example, the density of the first LEDs, which emit in a range of 390 nm to 430 nm, especially in a range of 400 nm to 420 nm, can be greater than that of the second LEDs, which emit in a range above 550 nm, for example in a range between 600 nm and 900 nm.

[0149] As explained above, third LEDs can also be provided, emitting in a third wavelength range that differs from the first wavelength range of the first LEDs and the second wavelength range of the second LEDs. These third LEDs can also be arranged in patterns, with the spatial density of the LEDs in the third group being equal to or different from the spatial density of the LEDs in the first and / or second groups.

[0150] For example, the first LEDs of the first group and the second LEDs of the second group can be arranged alternately in horizontal strips.

[0151] It is also possible that the first group of LEDs contains subgroups that can be individually controlled. Likewise, each LED, or at least a pair of LEDs in the first group, can be individually controlled to achieve the most homogeneous illumination possible. This is particularly advantageous for the LEDs in the first group that excite the photosensitizer.

[0152] In principle, the LEDs of the second or even the third group can also be subdivided into individual subgroups that can be controlled separately.

[0153] The lighting device described here allows for group or individual control of the LEDs, thereby enabling homogeneous illumination of the head with a defined energy input. This makes it possible for the first time to achieve light-assisted homogeneous illumination around the entire head, particularly when using photoinduced singlet oxygen generation with photosensitizers such as the phenalenones and phenalenone derivatives mentioned here. EXECUTION FORMS

[0154] In light of the above explanations, various embodiments are listed below that can be suitably combined with all the embodiments described herein. 2024-INV-0017 -33- Embodiment 1: Lighting device for hair, in particular for head hair, comprising: a support device defining an interior space with an outer contour, wherein the interior space of the support device is dimensioned such that the support device is suitable to at least partially surround a human head at a distance; a plurality of light sources emitting radiation in the range of 230 nm to 1000 nm, in particular from 380 nm to 1000 nm, in particular from 380 nm to 900 nm, in particular from 380 nm to 800 nm, in particular from 380 nm to 450 nm, and in particular from 400 nm to 420 nm, and which are arranged distributed on the support device, wherein each light source is configured to emit a cone of light directed towards the interior space; and a control device for controlling the light sources, wherein the light sources are arranged and controllable by the control device.that light cones from neighboring light sources partially overlap in a virtual area spaced from the outer contour and have an average irradiance of 5 to 70 mW / cm, 2 , especially 10 to 50 mW / cm² 2 and in particular 25 to 40 mW / cm² 2 in the virtual area, wherein the virtual area extends from the outer contour at a distance of 1 to 70 cm, in particular 1 to 50 cm, in particular 3 to 50 cm, in particular 5 to 25 cm, and the virtual area is intended to represent the contour of a human head. Embodiment 2: Lighting device according to embodiment 1, wherein the Light sources can be controlled in groups by the control device. embodiment 3: Lighting device according to one of the previous Embodiments wherein the light sources comprise first light sources with a first emission wavelength and second light sources with a second emission wavelength different from the first emission wavelength. embodiment 4: Lighting device according to one of the previous Embodiments wherein the light sources are arranged to emit radiation with different wavelengths, such that by selectively controlling the light sources, one part of the light sources emits radiation with a first wavelength and another part of the light source emits radiation with a second wavelength. Embodiment 5: Lighting device according to embodiment 3 or 4, wherein the first emission wavelength differs from the second emission wavelength by at least 100 nm, in particular by at least 200 nm. 2024-INV-0017 -34- Embodiment 6: Lighting device according to one of embodiments 3 to 5, wherein the first emission wavelength differs from the second emission wavelength by a maximum of 600 nm, in particular by a maximum of 400 nm. embodiment 7: Lighting device according to one of the previous Embodiments wherein the light sources or the first light sources emit in a range of 380 nm to 450 nm, in particular in a range of 400 nm to 420 nm. Embodiment 8: Lighting device according to one of embodiments 3 to 7, wherein the second light sources emit in a range above 450 nm, in particular above 500 nm and in particular above 550 nm. embodiment 9: Lighting device according to one of the previous Embodiments wherein each light source has a lens device to shape the light cone directed towards the interior. embodiment 10: Lighting device according to one of the previous Embodiments, wherein the support device has at least two adjustable wing elements which, when the lighting device is used as intended, are located on opposite sides of the head, and at least one head element which, when the lighting device is used as intended, is located above the head, wherein a plurality of light sources are arranged distributed on each wing element and on the head element. Embodiment 11: Lighting device according to embodiment 10, wherein the The wing elements and / or the head element are adjustable in increments. Embodiment 12: Lighting device according to embodiment 10 or 11, wherein the light sources have a smaller lateral distance to the edge of one or each of the wing elements and / or the head element than in the center of the respective element. In particular, the light sources of each of the elements may have a smaller lateral distance to the edge compared to the center of the respective element. Embodiment 13: Lighting device according to one of embodiments 10 to 12, wherein the light sources of one or each of the wing elements and / or the head element at the edge have a different direction of emission than the light elements in the center of the respective element. For example, the light sources at the edge may emit light outwards compared to the light sources in the center. For example, the optical axis of the light sources at the edge may be inclined outwards relative to the optical axis of at least one light source in the center. 2024-INV-0017 -35- Embodiment 14: Lighting device according to one of embodiments 10 to 13, wherein the wing elements are pivotably mounted on the head element, in particular pivotably mounted outwards. embodiment 15: Lighting device according to one of the previous Embodiments wherein the control device is configured to vary the radiant power of individual light sources, groups of light sources, or all light sources over time. embodiment 16: Lighting device according to one of the previous Embodiments wherein the light sources are LEDs. Embodiment 17: Lighting device according to one of embodiments 1 to 9, wherein the support device is shell-shaped, for example in the form of a curved net of struts, and is adapted to completely surround at least an upper part of a human head at a distance. Embodiment 18: Lighting device according to embodiment 16, wherein the The support device comprises a plurality of radially arranged and curved first struts and a plurality of ring-shaped second struts connecting the first struts, with the light sources being attached to the first and / or the second struts. Embodiment 19: Lighting device according to embodiment 16 wherein the The support device has a closed outer shell. embodiment 20: Lighting device according to one of embodiments 16 to 18, wherein the support device has a downwardly extending extension with light sources to also surround the back of the head and neck of the human head. embodiment 21: Lighting device according to one of embodiments 16 to 19, wherein the outer contour of the interior of the support device is approximately semi-spherical and has a mean diameter of approximately 42 to 50 cm. embodiment 22: Lighting device according to one of embodiments 16 to 21 , wherein the arrangement of the light sources, in particular the lateral distance of the light sources from each other, is selected and the control device is controllable in such a way that the mean irradiance is between 25 and 45 mW / cm 2 at a distance of 5 to 20 cm, and in particular of 5 to 15 cm, wherein the radiation of the light sources is in the range of 390 nm to 430 nm, and in particular of 400 nm to 420 nm. embodiment 23: Lighting device according to one of embodiments 16 to 21 , wherein the arrangement of the light sources, in particular the lateral distance between the light sources 2024-INV-0017 -36- from each other, selected and the control device controllable in such a way that the average irradiance is 30 to 40 mW / cm² 2at a distance of 5 to 20 cm, with the radiation of the light sources being in the range of 390 nm to 430 nm, and in particular from 400 nm to 420 nm. Embodiment 24: Use of a lighting device according to one of the previous embodiments for optically stimulating a photosensitizer contained in a bleaching agent during the bleaching of hair in order to stimulate it to form singlet oxygen, wherein the bleaching agent comprises: (A) at least a first photosensitizer capable of generating singlet oxygen upon light excitation, (B) at least one persulfate salt, (C) at least one alkalizing agent, and (E) at least one hydrogen peroxide source. Embodiment 25: Use according to embodiment 24, wherein the first photosensitizer is selected from the group comprising phenalenones, turmeric, flavins, riboflavins, phenoxazines, phenothiazines, phthalocyanines, naphthalocyanines, xanthenes, chlorophyll A, chlorophyll B, porphyrins, coumarins, pyrenes, perylenes, acridine orange and tetrapyrroles, wherein the photosensitizer particularly comprises a phenalenone. Embodiment 26: Use according to embodiment 24 or 25, wherein the bleaching agent comprises a second photosensitizer selected from the group consisting of turmeric, flavins, riboflavins, phenoxazines, phenothiazines, phthalocyanines, naphthalocyanines, xanthenes, chlorophyll A, chlorophyll B, porphyrins, coumarins, pyrenes, perylene, acridine orange and tetrapyrroles, wherein the photosensitizer particularly comprises a phenalenone. Embodiment 27: Use according to one of embodiments 24 to 26, wherein the hair is placed on translucent films during optical excitation.

[0155] Although specific embodiments have been presented and described herein, it is within the scope of the present invention to modify the embodiments shown in a suitable manner without deviating from the scope of protection of the present invention. 2024-1 NV-0017 -37- REFERENCE MARK LIST 100 Lighting warning 110 Support device 111 Interior 112 Outer contour 113a, 113b Wing element / Element 114a, 114b head element / element 115 stands 116 Swivel joint 117 carriers 200 lighting device 210a First light sources or LEDs / first lighting zone (outdoors) 210b first light sources or LEDs / second lighting zone (center) 210c first light sources or LEDs / third lighting zone (indoors) 220a Second light sources or LEDs / first lighting zone (outside) 220b Second light sources or LEDs / second lighting zone (center) 220c second light sources or LEDs / third lighting zone (indoors) 300 lighting device 310, 320, 330 light sources / LEDs 311, 321, 331 Lens device / Collimator 312, 222, 322 Light cone 313, 323, 333 optical axis 340 Control device 350 support device 500 level / outer contour 510, 520 virtual area 530 Light source / LED 700 Level / Outer contour 710 projection 720, 740 virtual area 730 Light source / LED 900 Lighting device 910 Support device 911 first jetty 912 second bridge / ring 913 Center point 915 Extension of the support device 2024-INV-0017 -38- 920 Light source I LED 950 head 1100 Lighting device 1105 Holding device I Control device 1106 Arm 1107 Control element 1110 Support device 1111 Interior 1112 Outer contour 1113 Wing element 1114 Head element 1115 stands 1116 Access opening 1117 Mounting interface 1118 Fastening section 1119 Side edge 1120 frame 1221 Base plate 1122 Telescopic column 1123 Controls 1130 LEDs / light sources 1150 head 1160 Extension of the support device 1161 magnetic holder 1162 electrical contacts 1163 Mounting interface

Claims

2024-INV-0017 -39- REQUIREMENTS 1. Lighting device for hair, in particular for head hair, comprising: a support device (110, 350, 910) defining an interior (111) with an outer contour (112), wherein the interior (111) of the support device (110, 350, 910) is dimensioned such that the support device (110, 350, 910) is suitable to at least partially surround a human head at a distance; a plurality of light sources (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330, 920) emitting radiation in the range of 390 nm to 430 nm, and in particular from 400 nm to 420 nm, and arranged distributed on the support device (110, 350, 910), wherein each light source (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330, 920) is arranged to emit a cone of light (312, 322, 332) directed towards the interior (111), and a control device (350) for controlling the light sources (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330, 920), wherein the light sources (210a, 210b, 210c,220a, 220b, 220c, 310, 320, 330, 920) are arranged and controllable by the control device (340) such that light cones (312, 322, 332) of adjacent light sources (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330, 920) partially overlap in a virtual area (360) spaced from the outer contour (112) and have an average irradiance of 5 to 70 mW / cm, 2 , especially 10 to 50 mW / cm² 2 and in particular 25 to 40 mW / cm² 2 in the virtual area (360), wherein the virtual area (360) extends from the outer contour (112) at a distance of 1 to 70 cm, in particular 1 to 50 cm, in particular 3 to 50 cm, in particular 5 to 25 cm, and the virtual area is intended to represent the contour of a human head with hair.

2. Lighting device according to claim 1, wherein the light sources (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330, 920) can be controlled in groups by the control device (340).

3. Lighting device according to one of the preceding claims, wherein the light sources comprise first light sources (210a, 210b, 210c) with a first emission wavelength and second light sources (220a, 220b, 220c) with a second emission wavelength different from the first emission wavelength. 2024-INV-0017 -40- 4. Lighting device according to one of the preceding claims, wherein the light sources (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330, 920) are configured to emit radiation with different wavelengths, such that by selectively controlling the light sources (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330, 920) a portion of the light sources (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330, 920) emit radiation with a first wavelength and another portion of the light source (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330, 920) emits radiation with a second wavelength.

5. Lighting device according to claim 3 or 4, wherein the first emission wavelength differs from the second emission wavelength by at least 100 nm, in particular by at least 200 nm.

6. Lighting device according to one of claims 3 to 5, wherein the first emission wavelength differs from the second emission wavelength by a maximum of 600 nm, in particular by a maximum of 400 nm.

7. Lighting device according to one of the preceding claims, wherein the light sources (310, 320, 330, 920) or the first light sources (210a, 210b, 210c) emit in a range of 400 nm to 420 nm.

8. Lighting device according to any one of claims 3 to 7, wherein the second light sources (220a, 220b, 220c) emit in a range above 450 nm, in particular above 500 nm and in particular above 550 nm.

9. Lighting device according to one of the preceding claims, wherein each light source (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330, 920) has a lens device (311, 321, 331) to shape the light cone (312, 322, 332) directed towards the interior.

10. Lighting device according to one of the preceding claims, wherein the support device (110) has at least two adjustable wing elements (113a, 113b) which are located on opposite sides of the head when the lighting device (100) is used as intended, and at least one head element (14a, 114b) which is located above the head when the lighting device (100) is used as intended, wherein at 2024-INV-0017 -41- a plurality of light sources (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330) are distributed on each wing element (113a, 113b) and on the head element (114a, 114b).

11. Lighting device according to claim 10, wherein the wing elements (113a, 113b) and / or the head element (114a, 114b) are adjustable in detent positions.

12. Lighting device according to claim 10 or 11, wherein the light sources (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330) have a smaller lateral distance to the edge of one or each of the wing elements (113a, 113b) and / or the head element (114a, 114b) than in the center of the respective element.

13. Lighting device according to one of the preceding claims, wherein the control device (340) is configured to vary the radiant power of individual light sources, groups of light sources, or all light sources over time.

14. Lighting device according to any of the preceding claims, wherein the light sources (210a, 210b, 210c, 220a, 220b, 220c, 310, 320, 330, 920) are LEDs.

15. Lighting device according to one of claims 1 to 9, wherein the support device (910, 1110) is shell-shaped, for example in the form of a curved net of struts, and is adapted to completely surround at least an upper part of a human head at a distance.

16. Lighting device according to claim 15, wherein the support device (910) has a plurality of radially arranged and curved first struts (911) and a plurality of annular second struts (912) which connect the first struts (911), wherein the light sources (920) are attached to the first and / or the second struts (911, 912).

17. Lighting device according to claim 15, wherein the support device (1110) has a closed outer shell.

18. Lighting device according to one of claims 15 to 17, wherein the support device has a downwardly extending extension (915) with light sources 2024-INV-0017 -42- (920) also features to surround the back of the head and neck of the human head.

19. Lighting device according to one of claims 15 to 18, wherein the outer contour of the interior of the support device is approximately semi-spherical and has a mean diameter of approximately 42 to 50 cm.

20. Use of a lighting device according to one of the preceding claims for optically stimulating a photosensitizer contained in a bleaching agent during the bleaching of hair in order to stimulate it to form singlet oxygen, wherein the bleaching agent comprises: (A) at least a first photosensitizer capable of generating singlet oxygen upon light excitation, (B) at least one persulfate salt, (C) at least one alkalizing agent, and (E) at least one hydrogen peroxide source.

21. Use according to claim 20, wherein the first photosensitizer is selected from the group comprising phenalenones, turmeric, flavins, riboflavins, phenoxazines, phenothiazines, phthalocyanines, naphthalocyanines, xanthenes, chlorophyll A, chlorophyll B, porphyrins, coumarins, pyrenes, perylenes, acridine orange and tetrapyrroles, wherein the photosensitizer in particular comprises a phenalenone.

22. Use according to claim 20 or 21, wherein the hair is placed on translucent films during optical excitation.

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