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In recent years, LED lighting has developed rapidly, but the inherent light biosafety issues of lamps, especially in the illumination, can kill human eye cells in large quantities and eventually cause blindness. Among the LED blue light damage, the first thing that bears the brunt is the delicate eyes.
According to the reporter's understanding, most of the current industry still uses white chips and yellow phosphors to stimulate white light, so the blue light problem is born. It is reported that some research institutions are studying non-Blu-ray chips to synthesize LED white light, but it will take some time from commercial use.
Guangzhou Jinyuan Polymer Extrusion Technology Co., Ltd. (hereinafter referred to as “Guangzhou Jinyuanâ€) has developed PC lampshade materials that eliminate LED blue light hazards.
According to Dr. Deng Huijun, General Manager of Guangzhou Jinyuan, the main component of this LED blue light-emitting PC lampshade is transparent PC (polycarbonate), diffusing agent, toughening agent, UV agent, flame retardant, etc. Optimized with computer simulation, synthetic granulation proofing. Excellent mechanical properties, good UV resistance, weather resistance, heat distortion temperature up to 139 ° C, no yellowing, no cracking, no moisture absorption, stable performance.
“We introduced nano-materials in the base material and extrusion molding. The process is the same as that of ordinary lampshades, no additional equipment investment is required. The thickness and shape can be customized according to customers' wishes, and will not increase more production difficulties.†Deng Huijun said The PC lampshade has high light transmittance, good concealability (diffusion), no dark spot, and its visual effect is the same as that of traditional fluorescent lamps. The light is soft and eye-catching, and the light transmittance is highest when the lamp bead is completely invisible. It can reach 87%, exceeding the highest 84% of the Japanese Teijin.
In addition, the performance of the lampshade can be customized as needed. In addition to eliminating blue light, the color temperature can be corrected. In the case of 0.5mm thickness, the flame retardant rating can reach V0/5VA.
According to the reporter, foreign markets, especially the high-end markets in Europe and America, pay more attention to photobiosafety. The International Organization for Standardization has long been concerned about the safety of LED light radiation. At first, LED products were included in the laser category and included in the IEC 60825-1 standard. But after all, LEDs and lasers are not the same, so the L ED standard was finally adjusted to the non-laser product standard IEC 62471 for evaluation. Although many countries such as Europe and Japan can also carry out LED light radiation safety requirements assessment according to IEC 60825-1, in the near future, all will adopt IEC 62471.
The emission limits, the measurement conditions of the lamp and lamp system, and the classification of the lamps are specified in IEC 62471. In terms of exposure limits, the standard clearly indicates the retinal blue hazard exposure limit and the retinal blue hazard exposure limit (small light source). Among them, the non-hazardous lamp must meet the damage of the retinal blue light (LB) within 10000s (about); the dangerous light of class 1 must meet the blue light damage of the retina within 100s; the hazard lamp of class 2 must meet the retina within 0.25s. Blu-ray hazard.
At present, from the market situation, optical grade PC materials have always been monopolized by foreign companies represented by Japanese Teijin, which is not unrelated to the fact that mainland Chinese consumers always only pay attention to the terminal price of LEDs. At present, the LED lighting industry is playing a big price war. Under the circumstances that the specific standards have not yet been introduced, everyone is naturally reluctant to consider using a PC material lampshade that eliminates the LED blue light hazard to increase the extra cost.
According to the reporter's visit to several packaging companies, everyone is holding a wait-and-see attitude toward the blue light hazard of LED. Even with the recent domestic orders of listed companies, there are no LED luminaire manufacturers to propose specific procurement requirements for Blu-ray hazards. Deng Huizhen said that the current orders are mainly for school and government projects.
There are also packaging manufacturers who believe that their light source is in compliance with international standards even after testing according to IEC 62471 standard, and has applied for photobiosafety certification, so there is no need to add a PC material lampshade to eliminate LED blue light hazard to increase cost.
Deng Huizhen believes that as long as the blue chip and yellow phosphor are used to excite the white light, it is impossible to have no blue light band at all. It is possible that the cost of manufacturing a blue-free light source is higher than the cost of using a blue light-emitting PC material. Much more.
Unfinished, more information, please refer to the engineering LED's "good products LED" magazine April issue 
Guangzhou Jinyuan: LED photobiosafety polymer material solution
[Source: Gaogong LED 's " LED Good Products" magazine April issue (P28) reporter / Long Zonghui ]