A site museum display light source device for reducing and preventing colonization of photosynthetic organisms

Abstract

The application discloses a kind of for reducing and preventing and treating the light source device of the colonization of photosynthetic organism, including light source module, light source module includes at least four kinds of narrow spectrum LED light source, the center wavelength of four kinds of narrow spectrum LED light source is respectively located 460nm±5nm, 520nm±5nm, 595nm±5nm and 620nm±5nm, the half-height full width of each narrow spectrum LED light source is 15nm to 30nm;It also includes control module, control module is electrically connected with light source module, and is configured to switch light source module according to preset control instruction and run between at least three kinds of working mode, at least three kinds of working mode includes preventive inhibition mode, high fidelity display mode and strong effect killing mode.The application not only can provide high-quality lighting environment in daily display, but also can effectively prevent the colonization of photosynthetic organism from source, and provide non-chemical, non-contact physical killing means after disease occurs, provide a set of safe, efficient, environmentally friendly comprehensive lighting and biological disease prevention and treatment solution for site museum.

Description

Technical Field

[0001] This invention relates to the fields of cultural relic protection and lighting technology, and in particular to a display light source device for archaeological sites and museums used to reduce and prevent the colonization of photosynthetic organisms. Background Technology

[0002] With the continuous development of the concepts of in-situ preservation and display, more and more archaeological museums are exhibiting artifacts in their original or near-original environments. These environments typically feature high humidity, limited ventilation, and insufficient localized lighting. To meet the needs of public visits and research, artificial lighting is usually required. While providing visibility, artificial lighting can also provide the light energy needed for the growth of photosynthetic organisms such as microalgae, cyanobacteria, and mosses, leading to the formation of biofilms on the artifact surfaces. Biofilms not only affect the display effect but can also adversely impact the artifact surfaces through metabolic products, physical adhesion, and continuous growth.

[0003] In existing technologies, archaeological site museums often use broadband white light sources. These sources typically cover a wide visible light spectrum, which can adequately meet general lighting and color rendering needs, but they can also easily block the main absorption bands of photosynthetic pigments, thus increasing the risk of photosynthetic organism growth. On the other hand, while some single-band light sources have a certain inhibitory effect on photosynthetic organisms, their color rendering is poor, making it difficult to meet the requirements for displaying the true colors of artifacts in the core exhibition areas. For existing biofilms, current treatment methods mostly involve chemical treatment or ultraviolet irradiation. The former may bring risks of residues or secondary effects, while the latter may adversely affect some artifact materials.

[0004] Therefore, it is necessary to provide a light source device that can meet both the needs of display lighting and the needs of photosynthetic organism control, so as to reduce the risk of photosynthetic organism colonization in the archaeological site museum environment and effectively treat the biofilm that has formed when necessary. Summary of the Invention

[0005] The technical problem this invention aims to solve is to address the difficulty in simultaneously meeting the needs for bright illumination and photosynthetic organism control in existing archaeological site museum display lighting. This invention provides a display light source device for reducing and controlling photosynthetic organism colonization in archaeological site museums. It is suitable for environments such as caves, grotto temples, earthen sites, and on-site museums. Specifically, it relates to a display light source device for reducing and controlling the colonization of photosynthetic organisms such as microalgae, cyanobacteria, and mosses through a combination of narrow-spectrum light sources and patterned control. To solve the above technical problem, this invention adopts the following technical solution:

[0006] This invention discloses a display light source device for archaeological sites and museums for reducing and preventing the colonization of photosynthetic organisms. The device includes a light source module comprising at least four narrow-spectrum LED light sources. The center wavelengths of the four narrow-spectrum LED light sources are located at 460nm±5nm, 520nm±5nm, 595nm±5nm, and 620nm±5nm, respectively, and the full width at half maximum (FWHM) of each narrow-spectrum LED light source is 15nm to 30nm. The device also includes a control module electrically connected to the light source module and configured to switch the light source module between at least three operating modes according to preset control commands. The at least three operating modes include a preventative inhibition mode, a high-fidelity display mode, and a powerful eradication mode.

[0007] As a further improvement, in the preventive suppression mode, the control module is configured to control the light source module to turn on only the yellow narrow-spectrum LED light source with a center wavelength of 595nm±5nm.

[0008] As a further improvement, in the high-fidelity display mode, the control module is configured to control the light source module to simultaneously turn on four narrow-spectrum LED light sources and adjust the output of each narrow-spectrum LED light source so that the light power output ratio of yellow light, green light, red light and blue light is 6:3:0.5:0.5.

[0009] As a further improvement, in the high-efficiency extinguishing mode, the control module is configured to control the output power of the light source module so that the illuminance of the light emitted by the light source module on the surface of the cultural relic reaches 40,000 lux to 60,000 lux, and to control the light source module to continuously irradiate for 6 to 12 hours.

[0010] As a further improvement, the preferred illuminance for the powerful killing mode described in this invention is approximately 50,000 lx for 12 hours.

[0011] As a further improvement, in the high-fidelity display mode, the general color rendering index Ra of the mixed light of yellow, green, red and blue light output by the light source module is greater than 80.

[0012] As a further improvement, the light source device described in this invention is used for displaying cultural relics in caves, grotto temples, earthen ruins, or original site exhibition museums.

[0013] Compared with the prior art, the present invention has at least the following beneficial effects:

[0014] First, from the perspective of the overall technical solution, this invention successfully breaks through the technical bottleneck of traditional archaeological site museum lighting, which struggles to simultaneously achieve both "high color rendering" and "low biomass promotion," by combining a narrow spectrum of specific wavelengths with multi-mode intelligent control. This invention not only provides a high-quality lighting environment for daily displays but also effectively prevents the colonization of photosynthetic organisms at the source and offers non-chemical, non-contact physical methods for pest control after disease outbreaks. Therefore, it provides archaeological site museums with a safe, efficient, and environmentally friendly comprehensive lighting and biological pest control solution.

[0015] Secondly, this invention innovatively proposes a narrow-spectrum combination scheme based on a strategy to avoid the absorption peaks of plant photosynthesis. By selecting four narrow-spectrum LED light sources with center wavelengths of 460nm±5nm, 520nm±5nm, 595nm±5nm, and 620nm±5nm, the main absorption bands of photosynthetic pigments such as chlorophyll are precisely avoided. The technical effect of this innovative design is that while meeting visual lighting needs, it significantly reduces the light energy utilization efficiency of photosynthetic organisms. Experimental data show that, compared with full-spectrum white light, the narrow-band yellow light group of this invention achieves an inhibition rate of up to 98.33% based on chlorophyll a concentration and 86.76% based on ATP fluorescence intensity, thus achieving source control of photosynthetic organism colonization.

[0016] Third, this invention innovatively designs a high-fidelity display mode, solving the problem of poor color rendering of a single narrow-spectrum light source by mixing and outputting light in a specific power ratio (yellow:green:red:blue = 6:3:0.5:0.5). The technical effect of this innovation is that the general color rendering index Ra of the mixed light reaches over 85, fully meeting the requirements for the realistic color display of cultural relics in the core exhibition area. Simultaneously, the inhibition rate, measured by chlorophyll a concentration, still reaches 60.79% under this mode, successfully achieving the dual goals of high-fidelity display of cultural relics and inhibition of biological growth.

[0017] Fourth, this invention innovatively introduces a powerful eradication mode, utilizing high-intensity visible light (40,000 lx to 60,000 lx) for a specific duration (6 to 12 hours) of irradiation, replacing traditional chemical agents or ultraviolet treatment. The technical effect of this innovation is that it achieves highly efficient physical removal of existing biofilms without the need for chemical agents and avoiding secondary pollution. On-site treatment results show that after 12 hours of cumulative irradiation at 50,000 lx, the ATP fluorescence intensity of the sample decreased by approximately 92.87%, demonstrating a significant biofilm removal effect.

[0018] Fifth, and more importantly, this invention limits the appropriate working illuminance range (preferably 50,000 lx) in the high-intensity irradiation mode, achieving an excellent balance between processing efficiency and the safety of cultural relics. Compared with higher-intensity radiation treatments of 200,000 lx and traditional ultraviolet (UVC) treatments, the 50,000 lx irradiation of this invention shows a significant advantage in terms of safety for cultural relics containing organic matter (such as blue wool standard cards): high-intensity radiation and UV irradiation cause varying degrees of fading in organic materials, while 50,000 lx irradiation only causes perceptible changes in highly sensitive low-grade blue wool. Simultaneously, for inorganic heritage materials such as stone and soil, 50,000 lx irradiation has extremely high safety; after 1440 hours of continuous irradiation, no detectable changes occurred in their mineral composition and crystal structure, effectively avoiding potential damage to cultural relics caused by ultraviolet radiation. Attached Figure Description

[0019] Figure 1 This is a structural block diagram of the light source device of the present invention, showing the connection relationship between the light source module, the control module, and the optional environmental sensor;

[0020] Figure 2 This is a schematic diagram of the spectral distribution and color rendering index of the four narrow-spectrum LED light sources (red, yellow, blue, and green) and full-spectrum white light used in this invention.

[0021] Figure 3 This is a schematic diagram of the spectral power distribution of the high-fidelity display mode used in this invention, and a superimposed comparison diagram with the spectrum of the main pigments absorbed by plant photosynthesis;

[0022] Figure 4 This is a schematic diagram showing the changes in photosynthetic activity of representative microalgae under high-intensity light exposure during a powerful eradication mode. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments. It should be understood that the following embodiments are for illustrative purposes only and are not intended to limit the scope of protection of the present invention. Various modifications or substitutions can be made by those skilled in the art without departing from the concept of the present invention.

[0024] Example 1: Overall structure and working principle of the light source device of the present invention

[0025] This embodiment provides a light source device for reducing and controlling the colonization of photosynthetic organisms in archaeological site museums. The device includes a light source module and a control module. The light source module contains at least four narrow-spectrum LED light sources with center wavelengths of 460nm±5nm, 520nm±5nm, 595nm±5nm, and 620nm±5nm, respectively, and a full width at half maximum (FWHM) of 15nm to 30nm for each narrow-spectrum LED light source. The control module is electrically connected to the light source module and is configured to switch the light source module between at least three operating modes according to preset control commands. The operating modes include a preventative suppression mode, a high-fidelity display mode, and a powerful eradication mode. This light source device is suitable for the safety and display lighting of cultural relics in caves, grotto temples, earthen sites, and on-site exhibition museums.

[0026] Combination Figure 1 The diagram shown clearly illustrates the hardware connections of the light source device of this invention. Figure 1 As shown, the device mainly includes a light source module and a control module. The light source module integrates four independent narrow-spectrum LED light sources, with their center wavelengths strictly controlled within 460nm±5nm (blue light), 520nm±5nm (green light), 595nm±5nm (yellow light), and 620nm±5nm (red light), respectively. To ensure spectral purity and avoid stray light unexpectedly promoting photosynthesis, the full width at half maximum (FWHM) of each narrow-spectrum LED light source is controlled within the range of 15nm to 30nm. Figure 1 The diagram also illustrates the electrical connection between the control module and the light source module. The control module has a pre-set control program that allows it to intelligently switch between three operating modes—preventive suppression mode, high-fidelity display mode, and powerful elimination mode—based on preset control commands (including but not limited to timed control, manual button control, or environmental sensor feedback signals). This block diagram demonstrates that the device possesses multi-channel independent control capabilities, which forms the hardware foundation for subsequent switching between various complex spectral modes.

[0027] Example 2: Specific Implementation and Application Scenarios of the Preventive Suppression Mode

[0028] This embodiment illustrates the function of the preventative inhibition mode in suppressing the growth and colonization of mosses and microalgae, and verifies it using laboratory measurement data and the practical application scenario of "nighttime lighting during museum closures." In preventative inhibition mode, the control module is configured to control the light source module to activate only the yellow narrow-spectrum LED light source with a center wavelength of 595nm±5nm. During museum closures or in non-core exhibition areas (such as visitor passageways and auxiliary exhibition areas), color rendering requirements are not high, but it is necessary to maintain basic lighting and maximally suppress photosynthetic organism growth. In this case, the control module switches to preventative inhibition mode. In this mode, the control module controls the light source module to activate only the yellow narrow-spectrum LED light source with a center wavelength of 595nm±5nm.

[0029] Laboratory measurement data (microalgae): The cyanobacteria *Spirulina platensis*, *Anabaena*, and the green algae *Chlorella* were selected as representative photosynthetic microalgae. Under controlled culture conditions, they were exposed to white light, red light, yellow light, blue light, green light, and natural diffused light, respectively. Under artificial lighting conditions, the illuminance of each experimental group was maintained at 600 lx, and the daily light duration was 9 hours. The optical density (OD) of the culture medium at 680 nm was continuously measured. 680 The study evaluated the growth of microalgae under different spectral conditions. The results are shown in Table 1: all three plant species (Chlorella vulgaris, Spirulina platensis, and Anabaena sp.) grew under all tested spectral conditions, but the amount of biomass accumulation varied significantly across different wavelengths. For Chlorella, OD... 680Under white light, the biomass increased from 0.035 to 0.287, under red light to 0.241, and under blue light to 0.225, while growth was significantly lower under yellow (0.134), green (0.098), and diffuse natural light (0.071). *Spirulina* achieved the highest biomass under red light (0.536) and white light (0.446), followed by green (0.331), natural light (0.320), blue (0.276), and yellow (0.169). *Anabaena* exhibited a similar pattern, with final OD values ​​of 0.799 (white), 0.598 (red), and 0.588 (green), while biomass gradually decreased under blue (0.418), natural light (0.347), and yellow (0.318). In summary, Table 1 illustrates the differences in the effects of different monochromatic and white light on the biomass accumulation of the three microalgae. The data in Table 1 show that, compared to white, red, and blue light conditions, the overall biomass accumulation of the three tested algae was significantly lower under yellow and green light conditions, with the inhibition effect being most pronounced under yellow light. This result fully demonstrates that the 595nm yellow narrow-spectrum LED light source used in the preventive inhibition mode, because its wavelength perfectly avoids the absorption peaks of the main photosynthetic pigments of microalgae, can significantly reduce the germination and growth rate of microalgae from the source, making it very suitable for basic lighting in non-core exhibition areas or during museum closures.

[0030] The results above indicate that the yellow-light narrow-spectrum LED light source used in the preventive inhibition mode is beneficial for reducing the germination and growth rate of microalgae and is suitable for basic lighting in non-core exhibition areas or during closure.

[0031] Table 1 shows the effects of different light qualities on three types of algae.

[0032]

[0033]

[0034] Laboratory measurement data (bryophytes): Soil samples were collected from the archaeological site, thoroughly mixed, and placed in multi-well culture plates. Different bryophyte spores were inoculated into each well. The samples were then cultured under red, yellow, green, blue, white, and dark conditions, with an illumination controlled at 600 lux. Water was added regularly, and germination was observed. The 60-day experiment showed that none of the bryophyte spores germinated under darkness. White light resulted in the highest overall number of germination pores, with *Bryum macrocephalum* germinating in 3 pores, *Bryum gracilis* in 2, *Bryum versicolor* in 2, and *Bryum esculentum* in 1. In monochromatic light treatment, blue light showed relatively good germination, with *Bryum gracilis* reaching 3 pores, and *Bryum macrocephalum* and *Bryum versicolor* each 1 pore. Red light was next best, with *Bryum gracilis* germinating in 2 pores, and *Bryum macrocephalum* and *Bryum versicolor* each 1 pore. Green light resulted in only *Bryum macrocephalum* and *Bryum gracilis* each germinating in 1 pore. Under yellow light, none of the tested bryophyte spores germinated, and *Bryum esculentum* also failed to germinate under all light conditions except white light. Overall, the number of germination pores was lower under yellow and green light, with the fewest germinations observed under yellow light (Table 2). These results indicate that the preventative inhibition mode has a positive effect on reducing bryophyte spore germination.

[0035] Table 2 shows the number of bryophyte spores germinating in the soil of the archaeological site under different light qualities.

[0036]

[0037] Practical Application Scenario: During the closing hours of a certain earthen site museum (18:00 to 08:00 the next day), the control module automatically switched to a preventative suppression mode, turning on only the 595nm yellow LED and maintaining an illuminance of 600 lx. After 60 days of continuous operation, the number of moss spores germinating on the soil surface of the site under yellow light was almost zero, while moss colonization appeared over a significant area on the surface of the site under white light. Quantitative analysis of algal biofilm, using algal ATP content detection results, showed that the average ATP content of the biofilm in the white light group was 449.3 au, while that in the yellow light group was only 39.8 au. The ATP content was significantly lower than that in the white light control group. Compared with the white light group, the ATP content of algal biofilm in the yellow light group decreased by approximately 91.14% over six months. This effectively achieved preventative suppression of biological diseases while maintaining basic nighttime lighting, and is suitable for safe lighting in archaeological sites, museums, and caves.

[0038] In summary, the preventive inhibition mode of this invention effectively inhibits photosynthetic organisms such as microalgae and mosses while also providing basic lighting functionality, thus providing strong support for the daily management and display lighting of archaeological sites.

[0039] Example 3: Specific Implementation and Application Scenarios of High-Fidelity Display Mode

[0040] This embodiment illustrates the advantages of the light source device in high-fidelity display mode compared to monochromatic light and similar archaeological site display lighting. Combined with the practical application scenario of "archaeological site display," it demonstrates its dual function of inhibiting biological colonization while maintaining high color rendering and excellent display effects. Specifically, in the core display areas during museum opening (such as in front of murals, painted sculptures, and exquisite stone carvings), both high color rendering lighting to accurately reproduce the colors of the artifacts and control of the light's promoting effect on biological growth are required. At this time, the control module switches to high-fidelity display mode. In this mode, the control module controls the light source module to simultaneously activate four narrow-spectrum LED light sources and precisely adjusts the output power of each narrow-spectrum LED light source through the internal PWM (pulse width modulation) dimming circuit, ensuring that the light power output ratio of yellow light (595nm), green light (520nm), red light (620nm), and blue light (460nm) is strictly maintained at 6:3:0.5:0.5. Under this ratio, the general color rendering index Ra of the mixed light is greater than 80.

[0041] Comparison with other light sources under high-fidelity display mode: A survey and analysis of the lighting conditions in the display environments of four domestic archaeological site museums was conducted, and the results are shown in Table 3. Table 3 reflects the current lighting status of major archaeological site museums in China. From Table 3, it can be summarized that the color rendering index (CRI) of existing archaeological site museum light sources is generally high (91-98), but their spectra are mostly full-spectrum (380-780nm), with strong spectral intensity in the red and blue light regions. Combined with... Figure 2 The diagram shows a comparison of the spectral distribution and color rendering index of four narrow-spectrum LED light sources and full-spectrum white light. Figure 2 This intuitively demonstrates the fundamental difference in spectral energy distribution between monochromatic light and white light. From Figure 2 It can be seen that, in order to meet the need for clear display of cultural relics and their details, the color rendering index (CRI) of the light source is usually required to be no less than 80 in practical applications. However, the CRIs of the red, yellow, green, and blue monochromatic light sources used in this study are 9.3, -24.2, -32.1, and -56.3, respectively. When used alone, their color rendering performance is extremely poor, and they are only suitable for basic safety lighting, which cannot meet the display needs of core cultural relics at all. When used in combination, the color rendering index can reach more than 85, which can meet the display needs of cultural relics.

[0042] Table 3 shows the color rendering results of LED light sources and outdoor display light sources in different archaeological site museums.

[0043]

[0044] Practical Application: In a site exhibition area in Hangzhou, during opening hours (8:00 AM to 6:00 PM daily), the control module operates in high-fidelity display mode. Mixed light illuminates the soil surface, resulting in extremely high color fidelity (Ra reaching 85). Visitors can not only appreciate the overall outline of the artifacts but also clearly see the corresponding details. Simultaneously, because the spectral energy avoids the main absorption peak of chlorophyll, after six months of continuous display, only a very small amount of sparse algal patches appear on the surface of the site. Compared to the area illuminated by traditional white light, where a dense green biofilm has formed, chlorophyll analysis shows that the chlorophyll a concentration in the mixed light-high-fidelity mode is only 0.31 μg / g, while the chlorophyll a concentration in the traditional white light group is as high as 3.288 μg / g. The chlorophyll a content is significantly reduced, demonstrating a significant bio-inhibition effect.

[0045] In summary, combining Figure 3 The high-fidelity display mode spectral distribution pattern of the present invention demonstrates an avoidance strategy for the main absorbed pigments in plant photosynthesis. This light source significantly improves color rendering performance while also having a good biological inhibition effect, thereby achieving synergistic optimization of cultural relic display lighting and microbial growth control.

[0046] Example 4: Specific Implementation and Application Scenarios of High-Efficiency Extermination Mode

[0047] This embodiment illustrates the effectiveness of the high-efficiency eradication mode in treating moss and microalgae, and verifies it in a specific practical application scenario. When a significant biofilm of microalgae or moss has formed in a localized area of ​​the archaeological site due to abnormal temperature and humidity, emergency treatment is required. In this case, the control module switches to the high-efficiency eradication mode. In this mode, the control module is configured to control the light source module to output at full load, ensuring that the illuminance emitted by the light source module on the surface of the artifact reaches 40,000 lx to 60,000 lx, and controlling the light source module to continuously irradiate for 6 to 12 hours. The preferred operating parameters are: illuminance of 50,000 lx, continuous irradiation for 12 hours.

[0048] Laboratory Experiments: To evaluate the effects of high-intensity visible light on microalgae, representative green algae and cyanobacterial strains were selected and exposed to high-intensity light conditions. Two illuminance conditions were set: approximately 50,000 lx and approximately 200,000 lx. The maximum photochemical quantum yield (Fv / Fm) and non-photochemical quenching parameter (NPQ) of photosystem II were measured at different time points. The experimental results are as follows: Figure 4 As shown. Figure 4 This study presents the changes in photosynthetic activity (Fv / Fm value) over time of representative microalgae under high-intensity light exposure in a powerful eradication mode. Figure 4It can be clearly concluded that under high-intensity visible light of 50,000 lx and above, the photosynthetic activity of the tested microalgae decreased sharply with prolonged irradiation time. Furthermore, the non-photochemical quenching parameter (NPQ) reached zero under continuous irradiation, exhibiting a strong and irreversible photoinhibition effect. Further microscopic examination revealed significant morphological changes in Spirulina after high-intensity exposure compared to the control group. The treated samples showed browning of cells, structural fragmentation, and cytoplasmic leakage, indicating severe photodamage. These observations and data collectively demonstrate that irradiation levels ≥50,000 lx are a sublethal but highly destructive state, capable of inducing cumulative photoinhibition in microalgae within hours, subsequently leading to complete cell death.

[0049] Practical Application Scenario: A dense green microalgal biofilm had grown on the surface of an earthen archaeological site's exhibition area. After closing time, staff aimed the light source device of this invention at the affected area and switched the control module to a high-efficiency eradication mode. By adjusting the distance between the device and the site surface, and using a lux meter / spectrometer to measure the surface, a target illuminance of 50,000 lx was set, with irradiation timed for 12 hours. After a night of continuous high-intensity irradiation, the following day's observation revealed significant bleaching of the green biofilm, with broken and dead microalgal cells. Biochemical testing showed that the ATP fluorescence intensity in this area plummeted from 589 a.u. before treatment to 42.0 au, removing 92.87% of the biological activity. This demonstrates that the high-efficiency eradication mode has an extremely excellent removal effect on existing algal biofilms in actual field applications.

[0050] In summary, the powerful killing mode of this invention can completely destroy the photosynthetic system of microalgae and mosses through the physical action of high-intensity visible light, and has an excellent killing effect.

[0051] Example 5: Material safety evaluation of high-efficiency extermination mode and comparison with ultraviolet light.

[0052] Based on the highly efficient physical extinguishing effect of the high-efficiency extinguishing mode in Example 4, this example further provides a safety evaluation of this mode for cultural relics materials in practical applications, and compares it with the traditional ultraviolet (UVC) extinguishing method. At the same time, the safety boundary of the high-intensity light irradiation mode is verified to ensure the absolute safety of this mode in cultural relic protection.

[0053] Laboratory Experiment: To verify the safety of the powerful annihilation mode of this invention for cultural relics materials in practical applications and to compare it with the traditional ultraviolet (UVC) annihilation method, the following material safety evaluation experiments were conducted. Three representative materials were selected for exposure tests: (1) ISO Blue Wool Standard Card (levels 1 to 8, the lower the level, the more sensitive), representing organic materials and paint pigments; (2) Stone samples, representing stone heritage; (3) Standard soil samples, representing earthen site materials. The above samples were placed under the mixed light source of the powerful annihilation mode of this invention (illuminance set at the preferred 50,000 lx, the higher intensity 100,000 lx, and the extreme test 200,000 lx respectively) and traditional ultraviolet (257nm UVC radiation, intensity of about 200 μW / cm²) conditions for comparative testing. The distance between the light source and the sample surface was 15cm.

[0054] Comparison and analysis of experimental results:

[0055] 1. Comparison of Organic Materials: After 48 hours of continuous exposure to UVC, all levels of the blue wool standard cards showed significant fading, indicating that ultraviolet light is highly destructive to organic materials and unsuitable for use on the surfaces of artifacts containing organic matter. However, under the same duration of irradiation at the 50,000 lx intensity of this invention, only the low-level (levels 1-3) samples, which are extremely sensitive to light, showed perceptible changes, while the medium and high-level samples remained largely stable. This demonstrates that 50,000 lx visible light is significantly safer than ultraviolet light. The results of the higher intensity 100,000 lx and the extreme test 200,000 lx were between these two levels. However, even at the extreme test of 200,000 lx, the low-level blue wool showed significant fading, while the high-level did not show significant changes. This indicates that higher light intensity has a stronger potential destructive effect on organic materials, thus conversely confirming the scientific validity and necessity of setting the preferred illuminance of 50,000 lx in this invention.

[0056] 2. Inorganic Material Comparison: For stone and soil samples, after continuous irradiation at 50,000 lx for 1440 hours (far exceeding the 12 hours required for a single actual extermination), X-ray diffraction (XRD) analysis was performed to analyze changes in their mineral composition. The results showed that the main mineral phases remained stable, and no detectable changes occurred in their mineral composition and crystal structure. This indicates that 50,000 lx of high-intensity visible light is absolutely safe for inorganic cultural relic substrates.

[0057] 3. Bactericidal boundary verification: The results of bactericidal experiments on algae showed that light intensity above 20,000 lx could begin to kill algae; while medium and low light intensities between 600 lx and 20,000 lx actually promoted the growth of Spirulina platensis and other algae.

[0058] Therefore, this invention strictly controls the effective treatment illuminance of the powerful eradication mode within the range of 40,000 lx to 60,000 lx (preferably 50,000 lx). This parameter range is a "safe and effective window" that has been rigorously verified through experiments. It not only efficiently removes biofilms but also has extremely high safety for inorganic heritage materials such as stone and soil, while the risk to organic materials is also within a controllable range. It perfectly overcomes the shortcomings of traditional ultraviolet treatment, which easily leads to severe fading and irreversible damage to cultural relics.

[0059] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. All equivalent substitutions, improvements, or variations made within the spirit and principles of the present invention should fall within the scope of protection of the present invention.

Claims

1. A display light source device for archaeological sites and museums used to reduce and prevent the colonization of photosynthetic organisms, characterized in that, The system includes a light source module comprising at least four narrow-spectrum LED light sources, the center wavelengths of which are located at 460nm±5nm, 520nm±5nm, 595nm±5nm, and 620nm±5nm, respectively, and the full width at half maximum (FWHM) of each narrow-spectrum LED light source is between 15nm and 30nm. It also includes a control module electrically connected to the light source module and configured to switch the light source module between at least three operating modes according to preset control commands. These at least three operating modes include a preventative suppression mode, a high-fidelity display mode, and a powerful extermination mode.

2. The light source device according to claim 1, characterized in that, In the preventative suppression mode, the control module is configured to control the light source module to turn on only the yellow narrow-spectrum LED light source with a center wavelength of 595nm±5nm.

3. The light source device according to claim 1 or 2, characterized in that, In the high-fidelity display mode, the control module is configured to control the light source module to simultaneously turn on the four narrow-spectrum LED light sources and adjust the output of each narrow-spectrum LED light source so that the output power ratio of yellow light, green light, red light and blue light is 6:3:0.5:0.

5.

4. The light source device according to claim 3, characterized in that, In the powerful extermination mode, the control module is configured to control the output power of the light source module so that the illuminance of the light emitted by the light source module on the surface of the cultural relic reaches 40,000 lux to 60,000 lux, and to control the light source module to continuously irradiate for 6 to 12 hours.

5. The light source device according to claim 4, characterized in that, The preferred illuminance for the powerful killing mode is approximately 50,000 lx for 12 hours.

6. The light source device according to claim 1, 2, 4, or 5, characterized in that, In the high-fidelity display mode, the general color rendering index Ra of the mixed light of yellow, green, red and blue light output by the light source module is greater than 80.

7. The light source device according to claim 6, characterized in that, The light source device is used for displaying cultural relics in caves, grotto temples, earthen ruins, or original site exhibition museums.

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