Lighting devices with white light and non-white light sources

Abstract

Provided is a lighting device (244), comprising a plurality of light sources (103) emitting light along an optical axis (247); a light collector (241) adapted to collect light from the light sources, wherein the plurality of light sources (103) comprises: a first group of light sources (404), comprising a plurality of light sources, the plurality of light sources being drivable to emit white light, a second group of light sources (405), comprising a plurality of light sources, the plurality of light sources being drivable, such as being drivable only to emit non-white light (such as green light), wherein the plurality of light sources are drivable such that the total D of the light emitted from the lighting device is uv The value is greater than the first D of the light emitted from the lighting device originating from the first group of light sources (404). uv The value and the second D of the light emitted from the lighting device originating from the second group of light sources (405) uv Each of the values ​​is closer to zero, and the luminous efficiency of the second group of light sources (405) is higher than the luminous efficiency of the first group of light sources (404).

Description

Technical Field

[0001] The present invention relates to a lighting device, such as a lighting device comprising a plurality of light sources generating light and a plurality of light collecting devices, wherein the light collecting devices are suitable for collecting the generated light and converting the collected light into a plurality of light beams propagating along an optical axis, and more particularly to a lighting device for providing white light, and also to corresponding lamps, methods and uses. Background Art

[0002] The lighting device may be used, for example, in a luminaire such as a moving head light for producing various light effects and / or mood lighting associated with, for example, concerts, live performances, television shows, sporting events or as part of an architectural fixture producing various effects. Typically, an entertainment luminaire produces a light beam having a beam width and divergence, and may, for example, be a wash / flood luminaire that produces a relatively wide beam with a uniform light distribution, or it may be a profile luminaire suitable for projecting an image onto a target surface.

[0003] It is generally considered advantageous for a lighting device to be able to emit light with high luminous efficiency, and it is particularly advantageous for a white light lighting device to emit white light with high luminous efficiency, such as even when driven under conditions characterized by high currents and / or high (junction) temperatures that may be above sorting conditions (such as when it is driven under typical high light flux conditions). It is generally considered advantageous for a lighting device to have low correlated color temperature (CCT) variation (across the beam of emitted light and from fixture to fixture), and it is particularly advantageous for a white light lighting device to emit white light with high luminous efficiency, such as even under typical conditions of high light flux conditions.

[0004] Therefore, there is a need for an improved white light illumination device capable of emitting white light with high and / or increased luminous efficacy and / or with low and / or reduced correlated color temperature (CCT) variation. Summary of the invention

[0005] One object of the invention may be seen as providing a lighting device, method and / or use to improve at least one or more of luminous efficacy and / or correlated color temperature (CCT) variation. Another object of the invention is to provide an alternative to the prior art.

[0006] Therefore, a first aspect of the present invention aims to achieve the above-mentioned and several other objects by providing a lighting device, the lighting device comprising:

[0007] - Multiple light sources emitting light along an optical axis;

[0008] - a light collector adapted to collect light from the light source and to project at least a portion of said light along said optical axis,

[0009] The plurality of light sources include, for example, the following:

[0010] a first group of light sources, the first group of light sources comprising a plurality of light sources which can be driven to emit white light, such as the first group of light sources being white light sources, such as the first group of light sources being phosphor-converted white light emitting diodes (LEDs),

[0011] - a second group of light sources, the second group of light sources comprising a plurality of light sources which can be driven, such as can only be driven, to emit non-white light, such as having positive D uv light of a certain value, such as green light, such as the second group of light sources as green light sources,

[0012] The plurality of light sources can be driven so that

[0013] - the total D of the light emitted from the lighting device uv The value is greater than the first D of the light emitted from the lighting device originating from the first group of light sources. uv value and a second D of the light emitted from the lighting device originating from the second group of light sources uv Each of the values ​​is closer to zero, such as at least 0.001 or 0.002 or 0.0003 or 0.005 D uv point is closer to zero, and

[0014] -The luminous efficiency of the second group of light sources is higher than the luminous efficiency of the first group of light sources, such as at least 10% higher, such as at least 15% higher, such as at least 20% higher, such as at least 30% higher, such as at least 40% higher, such as at least 50% higher, such as when driven under the same conditions, such as when driven at the same current and (junction) temperature.

[0015] Usually, D uv Measured as positive or negative value. uv A value of 0 means the color is shifted toward magenta (i.e., below the black body line (BBL)). Some white LEDs may exhibit negative D when driven at their maximum rated current. uv Value. Positive D uv A value of 0 means the color is shifted toward green (i.e. above the blackbody line).

[0016] The invention may be particularly, but not exclusively, advantageous for obtaining a lighting device for emitting white light having a reduced distance / deviation from the black body line (BBL), i.e. having a lower absolute D compared to light emitted (only) from the first group of (white light) light sources. uv values, such as even when the first group of (white light) light sources is driven under conditions characterized by high currents and (junction) temperatures that may be higher than the sorting conditions (such as when it is driven under typical high light flux conditions).

[0017] The present invention may additionally and / or alternatively be advantageous for obtaining a lighting device for emitting white light, wherein the lighting device has a high luminous efficiency. It can be seen as the insight of the inventors that a white light source may emit a non-zero D uv The light of the value of the black body line (BBL) can be used to improve the luminous efficiency because it makes it possible to combine a first group of (white light) light sources with a second group of (non-white light) light sources, where the latter have a higher luminous efficiency than the former (for example, compared to white light LEDs, green light LEDs based on ceramic converters can have a luminous efficiency that is about 30-60% higher, depending on the driving conditions), so that the overall luminous efficiency is improved. In general, ceramic converters are able to withstand high operating temperatures because they are not based on phosphors in epoxy or silicone. In addition, the latter are selected so that the total D of the former and the latter is uv The value is closer to zero than either of the former and the latter, i.e., the improvement of the luminous efficiency of the total emitted white light is surprisingly achieved via a non-white light source without affecting the Duv value, and in fact improves D uv value (i.e., reducing the distance from the black body line of the light from the combination of the first and second groups of light sources compared to either one).

[0018] The present invention may additionally and / or alternatively facilitate reducing correlated color temperature (CCT) variations. In a similar manner to the insights presented in the previous section, the present invention provides the insight that a second set of (non-white) light sources may be utilized to reduce correlated color temperature (CCT) variations, the effect of which may be due to the second set of light sources having a lower correlated color temperature (CCT) variation than the first set of light sources.

[0019] It may be noted that these insights may be particularly relevant if the first group of light sources comprises, such as consists of, white light LED sources with converters such as phosphor-based converters or ceramic / crystal converters driven for wavelength conversion under high flux conditions (possibly above sorting conditions), such as high current density (e.g. 3 A / mm 2 ) and high junction temperature (e.g., T j =120°C), where D uv The value may become magenta-shifted (i.e., shifted down to lower D uv value) and / or wherein the second group of (non-white light) light sources are green LED sources with a converter for wavelength conversion (such as a phosphor-based converter).

[0020] "Illuminating device" is understood as a device for providing light through a light gate, such as a circular light beam with a certain diameter at the gate and a certain (beam) angle. The light gate itself can have different geometric shapes, such as circular, elliptical, rectangular or square. An illuminating device can be understood as comprising a light source and an optical device for providing a light beam with the desired parameters at the gate.

[0021] "Light source" is understood as is common in the art and may typically be an electrical light source that converts electrical energy into luminous flux, such as a light emitting diode (LED), such as a converted LED, such as a phosphor converted LED or a chip on board (COB).

[0022] A "light collector" may be understood as an optical component or system capable of redirecting light, such as receiving (collecting) light having a direction and re-emitting the light in another direction, such as comprising one or more (refractive) lenses and / or (reflective) reflectors. A "light collector" may in particular be converging, such as being capable of receiving light having a certain (wide) angle from a light source and re-emitting a beam having a smaller angle, collimating a beam or even focusing the received light. A light collector may comprise a plurality of lenslets, each lenslet collecting light from one of the LEDs and converting the light into a corresponding beam, or the light collector may also be embodied as a single optical lens.

[0023] The first group of light sources includes a plurality of light sources, such as at least 10, such as at least 25, such as at least 50, such as at least 75, such as 100 or more light sources.

[0024] “Drivable to emit white light” may be understood as meaning that for some or all conditions, the light sources within the first group of light sources must be able to emit white light.

[0025] "White light" is understood to be common in the art and / or may be specifically understood to have a D in the interval [-0.025; +0.025] uv "White light" may be understood as having a correlated color temperature (CCT) in the interval [2600K; 9500K], such as the interval [5000K; 9000K], such as the interval [2700K; 6500K]. "White light" may be (optionally) additionally or alternatively understood as having a correlated color temperature (CCT) in the interval [2600K; 9500K], such as the interval [5000K; 9000K], such as the interval [2700K; 6500K].

[0026] Color rendering index CIE R of at least 60 a value, and the correlated color temperature (CCT) in the interval [2600K; 9500K].

[0027] The "D" of a color point in the chromaticity coordinate system uv ” describes its distance from the black body curve (or black body line (BBL)). uv The value may be given as defined by the American National Standards Institute (ANSI), such as defined in C78.377, such as defined in ANSI C78.377-2017 (National Electric Lamp Standard—Chromaticity Specification for Solid-State Lighting Products).

[0028] References to chromaticity and chromaticity (coordinate) systems are generally understood to be references to the CIE (International Commission on Illumination) 1931 color space.

[0029] The second group of light sources comprises a plurality of light sources, such as at least 2, such as at least 5, such as at least 15, such as at least 10, for example 20 or more light sources.

[0030] The total number (sum) of light sources in the first group of light sources and the second group of light sources may be at least 10, such as at least 20, such as at least 40, such as at least 60, such as at least 80, such as at least 100, such as 120 or more.

[0031] "Non-white light" is understood to be light that is common in the art and / or can be specifically understood as light that does not meet the conditions of "white light". It can also be understood that non-white light is (human) visible light, such as light with at least a wavelength in the interval [400; 700] nanometers (nm).

[0032] “The total D of light emitted from the lighting device uv The "value" can be understood as the average D value of the light leaving the lighting device (such as passing through the light gate of the lighting device). uv value.

[0033] “D of the light emitted from the lighting device originating from the first group of light sources uv The value can be understood as the average D value of the light emitted from the lighting device. uv Values, such as by a light shutter of the lighting device, do not take into account light originating from the second group of light sources.

[0034] “The light emitted from the lighting device originates from the second group of light sources D uv The value can be understood as the average D value of the light emitted from the lighting device. uv Values, such as by a light shutter of the lighting device, do not take into account light originating from the first group of light sources.

[0035] "Luminous efficiency" is understood as is common in the art, in particular as the ratio of luminous flux to power consumption. It should be understood that in order to compare the luminous efficiency of different sources, the same conditions are assumed, such as a set of drive current and junction temperature (1A; 25°C) or alternatively a set of drive current and junction temperature (3A; 120°C).

[0036] According to one embodiment, a lighting device is provided, wherein the first group of light sources includes a plurality of light sources that can be driven to emit light having a negative D uv Value of light, such as equal to or less than -0.006 D uv Values, such as D equal to or less than -0.015 uv According to one embodiment, a lighting device is provided, wherein the second group of light sources includes a plurality of light sources that can be driven to emit light having a positive D uv Value of light, such as equal to or greater than 0.006 D uv Values, such as D equal to or greater than 0.015 uv Values, such as D equal to or greater than 0.025 uv value.

[0037] According to one embodiment, a lighting device is provided in which a first group of light sources and a second group of light sources can be driven to have D values ​​of opposite signs relative to each other. uv One advantage may be that the total D of the total emitted light including contributions from both the first light source and the second light source is uv The value will be greater than that of either the first or second light source. uv The value is closer to zero.

[0038] According to one embodiment, a lighting device is provided, wherein the second group of light sources includes a plurality of light sources that can be driven to emit green light, such as a second group of light sources as green light sources, such as a second group of light sources as phosphor-converted green light emitting diodes (LEDs). "Green light" can be understood as being common in the art, such as light having coordinates in the CIE 1931 color space falling within the region defined by the following lines: (a) black body line, (b) achromatic point such as (x; y) = (1 / 3; 1 / 3) and a monochromatic point with a wavelength of 490nm (at the edge of the visible region), and (c) achromatic point such as (x; y) = (1 / 3; 1 / 3) and a wavelength of 570nm and excluding white light (such as excluding a positive D equal to or less than 0.015). uvAccording to a more specific definition, "green light" may be understood as light having coordinates in the CIE 1931 color space that fall within the region bounded by the following lines: (a) the black body line, (b) the line between the achromatic point such as (x; y) = (1 / 3; 1 / 3) and the monochromatic point with a wavelength of 510 nm (at the edge of the visible region), and (c) the line between the achromatic point such as (x; y) = (1 / 3; 1 / 3) and the monochromatic point with a wavelength of 570 nm and excluding white light (e.g., excluding light with a positive D value equal to or less than 0.015). uv The line between the monochromatic points (at the edge of the visible region) of the light with the highest value (at the edge of the visible region). According to a more specific definition that can be combined with any of the foregoing definitions of green light, the chromaticity coordinate (y) is at least 0.45. According to a specific definition, green light can be defined as light with chromaticity coordinates (in the CIE 1931 chromaticity diagram) of x>0.2 and y>0.50, such as x>0.3 and y>0.6, such as defined by a rectangle in the CIE 1931 chromaticity coordinate system, wherein the angular coordinates of the rectangle are (x; y)=(0.3093; 0.6398), (x; y)=(0.3160; 0.6498), (x; y)=(0.3260; 0.6431) and (x; y)=(0.3193; 0.6331).

[0039] According to one embodiment, a lighting device is provided, wherein the total D of light emitted from the lighting device is uv The value is greater than the first D of the light emitted from the lighting device originating from the first group of light sources. uv value and a second D of the light emitted from the lighting device originating from the second group of light sources uv Each of the values ​​is closer to zero, such as where the ratio of the intensity of light emitted from the first group of light sources to the intensity of light emitted from the second group of light sources is substantially fixed. Such an embodiment can be implemented, for example, by providing appropriate relative intensities of light emitted from the first group of light sources and light emitted from the second group of light sources during manufacturing, such as by electronically adjusting the relative power supplies, and optionally fixing the settings accordingly. Alternatively, such an embodiment can be implemented by fixing the number of light sources of the first group of light sources and the second group of light sources for each string.

[0040] According to one embodiment, a lighting device is provided in which the intensity ratio of light emitted from a first group of light sources to light emitted from a second group of light sources can be controlled, such as during use. This may be advantageous for allowing a user to change (such as optimize) settings after manufacture, which may be advantageous, for example, for achieving D uvA value of zero (even if the emission characteristics drift over time) is provided, such as for achieving a slight deviation from the black body line (BBL), which may be preferred in some circumstances. According to one embodiment, a lighting device is provided in which the intensity of light emitted from each of the first and second groups of light sources can be controlled independently of each other, such as independently of each other during use.

[0041] According to one embodiment, a lighting device is provided, wherein one or more light sources in the second group of light sources are placed between light sources in the first group of light sources in a tangential direction and / or radial direction relative to the optical axis, such as wherein the average (such as geometric mean and / or intensity weighted average) position of each of the first and second groups of light sources is substantially at the optical axis (such as within 3 mm, such as within 2 mm, such as within 1 mm, such as within 0.5 mm, such as within 0.1 mm from the optical axis), such as at the optical axis, and / or the average distance from the outermost radius of the light source layout to the optical axis is within 7%, such as within 5%, such as within 2%, such as within 1%, such as within 0.5%, and / or one or more light sources in the second group of light sources are placed between light sources in the first group of light sources according to rotational symmetry, such as 6-fold symmetry, such as 4-fold symmetry or such as 3-fold symmetry, wherein the 6-fold symmetry of the first and second groups of light sources is a preferred embodiment. A possible advantage may be that different colors are (evenly) distributed over a light source area such as an LED array to minimize color artifacts.

[0042] According to one embodiment, a lighting device is provided wherein the one or more light sources placed furthest relative to the optical axis are within a first group of light sources. A possible advantage may be that, for example, non-white light LEDs, such as LEDs with saturated colors (such as green), have a more uniform color distribution than, for example, white light LEDs, and placing them at the edge may reduce, minimize, or even avoid color artifacts at the edge of the beam in mid-air, such as colored areas at the edge of the beam.

[0043] According to one embodiment, a lighting device is provided in which light sources with other spectral characteristics, such as other spectral characteristics in addition to the spectral characteristics of the light sources from within the first group or from within the second group, are included in the plurality of light sources. One possible advantage is that, for example, other spectral characteristics (such as other colors) may be beneficial for adjusting the color point and / or color quality CRI. The light sources with other spectral characteristics may include any one or more of the following: red, converted red, amber, converted amber, yellow, converted yellow, green, cyan, converted lime green, blue, royal blue, and converted magenta (such as a blue mode whose red phosphor leaks a portion of the blue pump).

[0044] According to one embodiment, a lighting device is provided, wherein the white light has a D in the interval [-0.015; +0.015], such as the interval [-0.011; +0.011], such as the interval [-0.011; +0.010], such as the interval [-0.010; +0.010], such as the interval [-0.006; +0.006], such as the interval [-0.003; +0.003], such as the interval [-0.001; +0.001]. uv Values, and light with a correlated color temperature (CCT) in the interval [2600K; 9500K], such as the interval [5000K; 9000K], such as the interval [2700K; 6500K].

[0045] According to one embodiment, a lighting device is provided, wherein the lighting device can be driven to emit a total D in the interval [-0.015; +0.075] uv Light of values, such as the interval [-0.015; +0.050], such as the interval [-0.015; +0.025], such as the interval [-0.015; +0.015], such as the interval [-0.011; +0.011], such as the interval [-0.011; +0.010], such as the interval [-0.010; +0.010], such as the interval [-0.006; +0.006], such as the interval [-0.003; +0.003], such as the interval [-0.001; +0.001].

[0046] According to one embodiment, a lighting device is provided, wherein the number of light sources in the first group of light sources is 2 times or more the number of light sources in the second group of light sources, such as

[0047] More than twice the number of light sources in the second group of light sources, such as 3 or more times, such as 4 or more times, such as 5 or more times higher than the number of light sources in the second group of light sources.

[0048] According to one embodiment, a lighting device is provided in which a first group of light sources and a second group of light sources are maintained in separate strings. "String" is understood to be common in the art, such as a string of LEDs, where a plurality of LEDs can be dimmed together. An advantage of maintaining the first group of light sources and the second group of light sources in different strings may be that their absolute intensities can be adjusted, such as dimmed, independently of each other.

[0049] According to one embodiment, a lighting device is provided in which different strings have different ratios of light sources from within the first group of light sources and from within the second group of light sources. One advantage of this may be that the relative intensity of light emitted from the first group of light sources and the second group of light sources may be adjusted.

[0050] According to one embodiment, a lighting device is provided, wherein each light source in the second group of light sources comprises a ceramic converter for wavelength conversion. A possible advantage may be that the second group of light sources can achieve higher luminous efficiency through the ceramic converter, and optionally can also withstand higher current density and / or higher brightness output.

[0051] According to one embodiment, a lighting device is provided, wherein each light source of both the first group of light sources and the second group of light sources comprises a ceramic converter for wavelength conversion.

[0052] According to one embodiment, a lighting device is provided, wherein the illuminance of the first group of light sources can be driven to 350 lm / mm for the effective light emitting surface. 2 Above, such as 400lm / mm 2 Above, such as at 450lm / mm 2 According to one embodiment, a lighting device is provided, wherein the illumination of the second light source group can be driven to be 250 lm / mm 2 Above, such as 300lm / mm 2 Above, such as 400lm / mm 2 Above, such as 500lm / mm 2 For example, for profile lighting or other etendue-limited applications, it may be important and relevant to know how high and how much output a light source can achieve for a particular size fixture. Illuminance is understood to be for DC operation (not flash) and is expressed in square millimeters (mm). 2 ) is measured in lumens (lm).

[0053] According to one embodiment, a lighting device is provided, wherein the luminous efficiency of the second group of light sources is at least 15% higher than the luminous efficiency of the first group of light sources, such as at least 20% higher, such as at least 25% higher, such as at least 30% higher, such as at least 40% higher, such as at least 50% higher.

[0054] According to one embodiment, a lighting device is provided, wherein a light collector comprises a plurality of lenslets adapted to collect light from a light source and to convert the collected light into a plurality of light beams such that the light beams propagate along the optical axis, wherein each of the lenslets comprises an entrance surface through which the light enters the lenslet and an exit surface through which the light leaves the lenslet. A "lenslet" may be understood as a lens (of any size, and optionally very small) in an array.

[0055] According to one embodiment, a lighting device is provided, which also includes one or more color filters, such as color filters for subtractive color mixing, such as dichroic filters or color gels arranged to be traversed by the optical axis. The color filters can be graded and / or implemented via one or more color wheels.

[0056] According to one embodiment, a lighting device is provided, wherein each lenslet of a plurality of lenslets is a total internal reflection (TIR) ​​lens, or wherein the plurality of lenslets comprises two mutually superposed planar aspheric lens arrays, such as wherein the two arrays form a collimating optical system. One possible advantage is that the luminous efficiency of the lighting device is improved, for example, because the TIR lens is able to collect light from high emission angles up to ±90°, such as for collimation. As an alternative, each lenslet of the plurality of lenslets is a standard lens element, an aspheric freeform element, a collimating mixer rod, a circular or square compound parabolic concentrator (CPC), a Fresnel lens, or a combination of the above. As another alternative, the array of collimating elements may include, such as consisting of, a combination of different types of collimating elements placed at different positions in the array.

[0057] According to one embodiment, a lighting device is provided that includes one or more lenses with an anti-reflection (AR) coating. One possible advantage is higher luminous efficiency due to less loss due to reflection.

[0058] According to an embodiment, a lighting device is provided, wherein the lighting device is capable of delivering at least 10 klm (ie ten thousand lumens or 10 thousand lumens), such as at least 20 klm, such as at least 30 klm, such as at least 40 klm.

[0059] According to one embodiment, a lighting device is provided, which also includes a light gate arranged along the optical axis, and wherein a light collector is arranged between the plurality of light sources and the light gate. A "light gate" is understood to be a plane (orthogonal to the optical axis) in which the optical device of the lighting device (e.g., the light collector) is configured to concentrate and / or focus the light beam from the light source and / or the light gate is a physical aperture (i.e., such as a light gate is a physical aperture placed in or close to the plane in which the light beam of the light source is focused, such as where "close" means placed within a distance from the plane that deviates from the distance between the light source and the plane by no more than 20% or 15% or 10% or 5%), such as a beam shaping device.

[0060] According to a third aspect, a lamp is proposed, such as a moving head light comprising a lighting device according to the first aspect. A "lamp" is understood to be an electrical device comprising an (electrical) light source, such as a lighting system having a light source providing illumination, and wherein the light source and optionally one or more optical devices are at least partially enclosed in a housing. Technicians of (entertainment) lamps are aware that a variety of light effects can be integrated into the lamp. According to an embodiment, a lamp is provided, which has one or more of the following: a prism for a prismatic effect, an iris for an iris effect, a framing film for a framing effect, a frost filter for a frost effect, a device for a dimming effect, an animation wheel for an animation effect, one or more pattern plates. The (entertainment) lamp can be controlled based on an input signal indicating a light parameter, the light parameter can indicate a target color, the target color indicates a defined color of the emitted light, and a plurality of light effect parameters indicate various numbers of light effects. The (entertainment) lamp may include a processor configured to control different light effects of the lamp based on the light parameters received by the input signal. For example, a (entertainment) luminaire may comprise light effects and be controlled based on various parameters as described in WO 2010 / 145658, in particular on page 4, line 11 to page 6, line 9.

[0061] According to one embodiment, a luminaire is provided, wherein the luminaire is a moving head light. A moving head light may be understood as a luminaire having a rotating device, such as an actuator, for rotating the direction of light emitted from the luminaire about one or two axes orthogonal to the direction of light emitted from the luminaire. An example of such an embodiment may be given by a moving head light, such as described in WO 2010 / 145658 A1 (see for example Figure 1 to Figure 2 and accompanying description).

[0062] According to one embodiment, a lamp, such as a moving head light, is provided, comprising one or more actuators, such as electric motors, such as stepper motors and / or servo motors, for changing the direction of light emitted from the lamp, such as for rotating the direction of light emitted from the lamp around one or two axes orthogonal to the direction of light emitted from the lamp. A possible advantage is that the direction of the light can be changed in an automatic manner, which may be particularly relevant for example for theatre lighting, such as for stage performances. An example of such an embodiment may be given by a moving head light, such as described in WO 2010 / 145658 A1 (see for example Figure 1 to Figure 2 and accompanying description).

[0063] According to one embodiment, a luminaire is provided, the luminaire further comprising an optical projection system, such as being placed on an opposite side of an optical gate relative to a plurality of light sources, the optical projection system being adapted to collect at least a portion of the light that can be emitted from the lighting device, and being adapted to project at least a portion of the light along the optical axis. The optical projection system may, for example, be configured to project the light that passes through the optical gate along the main optical axis. The optical projection system may include a positive number of optical components, and the optical projection system may be configured to collect the light modified by the beam shaping object and project the collected light along the main optical axis. The projection system may be configured to adjust the beam width and / or divergence of the light beam that leaves the optical projection system, and may be adjusted to image the beam shaping object near the optical gate disposed at the target surface. The optical projection system may include an optical zoom group and / or an optical focusing group, such as being composed of or interchangeably used with an optical zoom group and / or an optical focusing group, such as wherein the optical zoom group includes at least one optical component and is configured to adjust the divergence and / or width of the light beam, and / or wherein the optical focusing group includes at least one optical component and is configured to focus the image of the beam shaping object at the target surface along the main optical axis. The optical projection system can be provided as a fixed optical component group with predefined focusing and zooming characteristics. At least one optical component of the optical zoom group and / or the optical focusing group can be any optical component known in the optical field, such as a lens, a prism, a reflector, etc. Further note that some optical components may be able to move relative to the main optical axis.

[0064] According to a third aspect, there is provided a method of lighting with the lighting device according to the first aspect or the luminaire according to the second aspect, comprising emitting light from a plurality of light sources.

[0065] According to one embodiment, a method is provided, the method further comprising adjusting the intensity ratio of the light emitted from the first group of light sources and from the second group of light sources, such as for adjusting the spectral distribution of the light emitted from the lighting device according to the first aspect. A possible advantage is that the method enables, for example, a user to change, for example, an optimization setting, for example to achieve D uv A value of zero or a slight deviation from the black body line (BBL) is achieved.

[0066] According to one embodiment, a method is provided, the method further comprising driving the first group of light sources to emit non-white light. A possible advantage of doing so is that when the first group of light sources are driven to emit non-white light, they may be able to produce higher brightness.

[0067] According to a fourth aspect, use of the lighting device according to the first aspect or the lamp according to the second aspect for lighting is provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] The first, second, third and fourth aspects according to the invention will now be described in more detail with reference to the accompanying drawings. The drawings illustrate one way of implementing the invention and should not be construed as limiting other possible embodiments falling within the scope of the appended claims.

[0069] Figure 1 The CIE 1931 color space is shown.

[0070] Figure 2 A luminaire 200 including a lighting device 244 is shown.

[0071] Figure 3 The figure shows a schematic structural diagram of a moving head lamp 302 .

[0072] Figure 4 The layout of LEDs 103 as viewed along the direction of optical axis 247 is shown. DETAILED DESCRIPTION

[0073] Figure 1 The CIE 1931 color space is shown, where the black body line (BBL), also known as the black body curve / locus or Planckian locus, is shown as a curve with a full circle mark. In an exemplary embodiment, the color coordinate light emitted from the first group of light sources at low intensity can be given by a star at approximately (x; y) = (0.525; 0.425) (where the actual distance from the black body line may be exaggerated for clarity). When the intensity is increased, the color coordinate may become shifted toward magenta, as shown by the downward (and leftward) arrow between the star and the triangle, and eventually reach the triangle. By adding light from the second group of light sources, which itself may have color coordinates indicated by a rectangle near (x; y) = (0.32; 0.64), it may shift the total color coordinate from the triangle along the dotted line between the triangle and the rectangle in the direction toward the rectangle, as shown by the upward arrow. The figure also shows regions in color space bounded by dashed lines that define green light according to embodiments, such as light having coordinates in the CIE 1931 color space that fall within the region bounded by the following lines: (a) a black body line, (b) a line between an achromatic point such as (x; y) = (1 / 3; 1 / 3) (as indicated by a five-pointed star) and a monochromatic point at a wavelength of 490 nm (at the edge of the visible region), and (c) a line between the achromatic point and a wavelength of 570 nm and excluding white light (such as excluding light having a positive D of equal to or less than 0.015). uv value of light) between monochromatic points.

[0074] Figure 2A luminaire 200 is shown that includes an illumination device 244, wherein the illumination device includes a plurality of LEDs 103, a light collector 241, a shutter 242, and an optical projection and zoom system 243. The light collector 241 is adapted to collect light from the LEDs 103 and convert the collected light into a plurality of light beams 245 (dashed lines) that propagate along an optical axis 247 (dotted lines). The light collector may be embodied as any optical device that is capable of collecting at least a portion of the light emitted by the LEDs and converting the collected light into light beams. In the illustrated embodiment, the light collector includes a plurality of lenslets, each lenslet collecting light from one of the LEDs and converting the light into a corresponding light beam. However, it is noted that the light collector may also be embodied as a single optical lens, a Fresnel lens, a plurality of TIR lenses (total reflection lenses), a plurality of light rods, or a combination thereof. It should be understood that the light beam propagating along the optical axis includes light rays propagating at an angle, such as an angle less than 45 degrees to the optical axis. The light collector can be configured to fill the light gate 242 with light from the light source 103, so that the area of ​​the light gate 242, i.e., the aperture, is illuminated with uniform intensity or optimized for maximum output. The light gate 242 is arranged along the optical axis 247. The optical projection system 243 can be configured to collect at least a portion of the light beam transmitted through the light gate 242 and image the light gate at a certain distance along the optical axis. For example, the optical projection system 243 can be configured to image the light gate 242 onto some objects such as a screen, such as a screen on a concert stage. Specific images, such as some opaque patterns provided on a transparent window, open patterns in a non-transparent material, or imaging objects such as GOBO known in the field of entertainment lighting, can be included in the light gate 242, so that the illuminated image can be imaged by the optical projection system. Therefore, the lighting device 200 can be used for entertainment lighting. In the illustrated embodiment, light is guided by the light collector 241 along the optical axis 247 and passes through multiple light effects before leaving the lighting device through the front lens 243a. The light effects can be, for example, any light effects known in the field of intelligent / entertainment lighting, such as a CMY color mixing system 251, a color filter 253, a gobo 255, an animation effect 257, an iris effect 259, a focusing lens group 243c, a zoom lens group 243b, a prism effect 261, a framing effect (not shown), or any other light effect known in the art. The light effects mentioned are only used to illustrate the principles of a lighting device for entertainment lighting, and a technician in the field of entertainment lighting will be able to construct other variants with additional fewer effects. It is further noted that the order and position of the light effects can be changed. The lighting device includes a cooling module 201 having a first blower 115 and a second blower 117. The lamp includes a lampshade 248 provided with a plurality of openings 250.

[0075] Figure 3The figure shows a schematic diagram of the structure of a moving head lamp 302, which includes a head 200, which is rotatably connected to a yoke 363, wherein the yoke is rotatably connected to a base 365. Figure 2 The luminaire shown in FIG. 1 is substantially the same, and substantially the same features are used as in FIG. Figure 2367 is connected to the yoke and arranged in a bearing (not shown) in the base. The pan motor 369 is connected to the shaft 367 by a pan belt 371 and is configured to rotate the shaft and the yoke relative to the base through the pan belt. The moving head light fixture includes a tilt rotation device for rotating the head relative to the yoke, for example, by rotating the tilt shaft 373 connected to the head and arranged in a bearing (not shown) in the yoke. The tilt motor 375 is connected to the tilt shaft 373 by a tilt belt 377 and is configured to rotate the shaft and the head relative to the yoke through the tilt belt. Those skilled in the art will recognize that the pan and tilt rotation devices can be constructed in many different ways using mechanical components such as motors, shafts, gears, cables, chains, transmission systems, bearings, etc. Alternatively, it is noted that the pan motor can also be arranged in the base and / or the tilt motor can be arranged in the head. The space between the yoke 363 and the bottom of the head is limited because the moving head fixture is designed to be as small as possible. As is known in the prior art, the moving head fixture receives power 381 from an external power source (not shown). Power is received by an internal power source 383, which adapts and distributes power to the subsystems of the moving head light through an internal power line (not shown). The internal power system can be constructed in many different ways, such as by connecting all subsystems to the same power line. However, those skilled in the art will recognize that some subsystems in the moving head light require different kinds of power, and a ground line can also be used. For example, in most applications, the light source requires different power from the stepper motor and the drive circuit. The lamp also includes a controller 385, which controls the components (other subsystems) in the lamp based on an input signal 387 indicating light effect parameters, position parameters and other parameters related to the moving head fixture. The controller receives an input signal from a light controller (not shown) known in the field of intelligent and entertainment lighting, for example by using standard protocols such as DMX, ArtNET, RDM, etc. Usually the light effect parameter indicates at least one light effect parameter related to different light effects in the lamp system. The controller 385 is suitable for sending commands and instructions to different subsystems of the moving head light through an internal communication line (not shown). The internal communication system can be based on various types of communication networks / systems. The moving head light can also include a user input device, so that the user can interact with the moving head light directly instead of using the light controller to communicate with the moving head light. The user input device 389 can be, for example, a bottom, a joystick, a touch pad, a keyboard, a mouse, etc. The user input device can also be supported by a display 391, so that the user can use the user input device to interact with the moving head light through a menu system displayed on the display. In one embodiment, the display device and the user input device can also be integrated into a touch screen.

[0076] Figure 4The layout of LED 103 observed in the direction along optical axis 247, for example, from light gate 242 toward LED 103 is shown. The first group of LEDs 404 is shown in an open structure, and the second group of LEDs 405 is shown in a closed (black) structure. The light sources in the second group of light sources are placed between the light sources in the first group of light sources in the tangential direction and radial direction relative to the optical axis (located at the center of the circular pattern and oriented perpendicular to the plane of the paper). The average (such as geometric mean and intensity weighted average) position of each of the first group of light sources and the second group of light sources is on the optical axis. The light source placed farthest relative to the optical axis is in the first group of light sources.

[0077] The first group of light sources may, for example, include, such as consist of, LEDs of type KW CSLNM1.TG from OSRAM OptoSemiconductors GmbH (Regensburg, Germany) and / or LEDs having the characteristics described in the corresponding product sheet (denoted as "Version 1.2" and dated 2018-05-07) (retrievable, for example, at https: / / www.osram-os.com / superior).

[0078] The second group of light sources may, for example, include, such as consist of, LEDs of type KP CSLNM1.F1 from OSRAM OptoSemiconductors GmbH (Regensburg, Germany) and / or LEDs having the characteristics described in the corresponding product sheet (denoted as "Version 1.6" and dated 2018-04-25) (retrievable, for example, at https: / / www.osram-os.com / superior).

[0079] Although the present invention has been described in conjunction with specific embodiments, it should not be interpreted as being limited in any way to the examples presented. The scope of the present invention is defined by the appended claims. In the context of the claims, the terms "comprise" or "comprising" do not exclude other possible elements or steps. In addition, references such as "one" or "a" should not be interpreted as excluding pluralities. The use of reference signs in the claims with respect to elements indicated in the drawings should also not be interpreted as limiting the scope of the present invention. In addition, the individual features mentioned in different claims may be advantageously combined, and the mention of these features in different claims does not exclude that the combination of features is impossible and advantageous.

Claims

1. A lighting device (244), comprising: - a plurality of light sources (103) emitting light along an optical axis (247); a light collector (241) adapted to collect light from the light source and to project at least a portion of the light along the optical axis (247), The plurality of light sources (103) include: - a first group of light sources (404), the first group of light sources comprising a plurality of light sources, the plurality of light sources being drivable to emit white light as white light sources, - a second group of light sources (405), said second group of light sources comprising a plurality of light sources, said plurality of light sources being drivable to emit non-white light, The plurality of light sources can be driven so that - the total D of the light emitted from the lighting device uv The value is greater than a first D of the light emitted from the lighting device originating from the first group of light sources (404). uv and a second D of the light emitted from the lighting device originating from the second group of light sources (405) uv Each of the values ​​is closer to zero, and - The luminous efficiency of the second group of light sources (405) is higher than the luminous efficiency of the first group of light sources (404).

2. The lighting device (244) according to claim 1, wherein the first group of light sources (404) comprises a plurality of light sources, the plurality of light sources being drivable to emit light having a negative D uv Worth the light.

3. The lighting device (244) according to claim 1 or 2, wherein the second group of light sources (405) comprises a plurality of light sources, the plurality of light sources being drivable to emit light having a positive D uv Worth the light.

4. The lighting device (244) according to claim 1 or 2, wherein the first group of light sources (404) and the second group of light sources (405) can be driven to have D values ​​of opposite signs relative to each other. uv value.

5. The lighting device (244) according to claim 1 or 2, wherein the second group of light sources (405) comprises a plurality of light sources, and the plurality of light sources can be driven to emit green light.

6. The lighting device (244) according to claim 1 or 2, wherein an intensity ratio of light emitted from the first group of light sources (404) to light emitted from the second group of light sources (405) is fixed.

7. The lighting device (244) according to claim 1 or 2, wherein an intensity ratio of light emitted from the first group of light sources (404) to light emitted from the second group of light sources (405) can be controlled.

8. The lighting device (244) according to claim 1 or 2, wherein one or more light sources in the second group of light sources (405) are placed between light sources in the first group of light sources (404) in a tangential direction and / or a radial direction relative to the optical axis.

9. The lighting device (244) according to claim 1 or 2, wherein one or more light sources that are placed farthest relative to the optical axis are within the first group of light sources (404).

10. The lighting device (244) according to claim 1 or 2, wherein light sources having other spectral characteristics, other than the spectral characteristics of the light sources from the first group (404) or from the second group (405), are included in the plurality of light sources.

11. The lighting device (244) according to claim 1 or 2, wherein the white light emitted from the lighting device has a D in the interval [-0.015; +0.015]. uv values, and light with a correlated color temperature (CCT) in the interval [2600K; 9500K].

12. The lighting device (244) according to claim 1 or 2, wherein the lighting device can be driven to emit a total D in the interval [-0.015; +0.015]. uv Worth the light.

13. The lighting device (244) according to claim 1 or 2, wherein the number of light sources in the first group of light sources (404) is two times or more the number of light sources in the second group of light sources.

14. The lighting device (244) of claim 1 or 2, wherein the first group of light sources (404) and the second group of light sources are held in separate strings.

15. The lighting device (244) of claim 1 or 2, wherein different strings have different ratios of light sources from within the first group of light sources (404) and light sources from within the second group of light sources.

16. The lighting device (244) according to claim 1 or 2, wherein each light source of the second group of light sources comprises a ceramic converter for wavelength conversion.

17. The lighting device (244) of claim 1 or 2, wherein each light source of both the first group of light sources (404) and the second group of light sources comprises a ceramic converter for wavelength conversion.

18. The lighting device (244) according to claim 1 or 2, wherein the illumination of the first group of light sources (404) can be driven to be 350 lm / mm for an effective light emitting surface. 2 above.

19. The lighting device (244) according to claim 1 or 2, wherein the illumination of the second group of light sources can be driven to be between 250 lm / mm 2 above.

20. The lighting device (244) according to claim 1 or 2, wherein the luminous efficiency of the second group of light sources is at least 15% higher than the luminous efficiency of the first group of light sources (404).

21. The illumination device (244) according to claim 1 or 2, wherein the light collector (241) comprises a plurality of lenslets, the lenslets being adapted to collect light from the light source and to convert the collected light into a plurality of light beams (245) such that the light beams propagate along the optical axis (247), wherein each of the lenslets comprises an entrance surface through which the light enters the lenslet and an exit surface through which the light exits the lenslet.

22. The illumination device (244) according to claim 1 or 2, further comprising one or more color filters (253) arranged to be transversely crossed by the optical axis (247).

23. The illumination device (244) of claim 21, wherein each lenslet in the plurality of lenslets is a total internal reflection (TIR) ​​lens, or wherein the plurality of lenslets comprises two planar aspheric lens arrays stacked on top of each other.

24. The lighting device (244) according to claim 1 or 2, comprising one or more lenses having an anti-reflective (AR) coating.

25. The lighting device (244) of claim 1 or 2, wherein the lighting device is capable of delivering at least 10 klm.

26. The lighting device (244) according to claim 1 or 2, further comprising a light shutter (242) arranged along the optical axis, and wherein the light collector (241) is arranged between the plurality of light sources and the light shutter (242).

27. The lighting device (244) of claim 1 or 2, wherein the first set of light sources are phosphor-converted white light emitting diodes (LEDs).

28. The lighting device (244) according to claim 1 or 2, wherein the non-white light emitted by the plurality of light sources of the second group of light sources has a positive D uv Worth the light.

29. A luminaire (200) comprising the lighting device (244) according to any one of the preceding claims.

30. The lighting fixture (200) of claim 29, wherein the lighting fixture is a moving head light (302).

31. The lamp (200) according to claim 29 or 30, wherein the lamp is a moving head light (302), which comprises one or more actuators, and the one or more actuators are used to change the direction of light emitted from the lamp (200), and to rotate the direction of light emitted from the lamp around one or two axes orthogonal to the direction of light emitted from the lamp (200).

32. The lamp (200) according to claim 29 or 30 further comprises an optical projection system (243), which is placed on the opposite side of the light gate (242) relative to the plurality of light sources (103), and is suitable for collecting at least a portion of the light that can be emitted from the lighting device, and is suitable for projecting at least a portion of the light along the optical axis (247).

33. A method for lighting using a lighting device (244) according to any one of claims 1 to 28 or a luminaire according to any one of claims 29 to 32, comprising emitting light from the plurality of light sources (103).

34. The lighting method according to claim 33, further comprising adjusting an intensity ratio of light emitted from the first group of light sources (404) and from the second group of light sources (405) to adjust a spectral distribution of light emitted from the lighting device (244) according to any one of claims 1 to 28.

35. The illumination method according to claim 33 or 34, further comprising driving the first group of light sources (404) to emit non-white light.

36. Use of the lighting device (244) according to any one of Claims 1 to 28 or the lamp (200) according to any one of Claims 29 to 32 for lighting.

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