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конечно лесен демант во однос плавата параноја од пост #130

To summarize the key findings, LED sourcesLED sources (lamps or systems) and luminaries are safe to the consumerand luminaries are safe to the consumer when used as intended.
 In terms of their level of photo biological safety, LED lamps are no different from traditional technologies such as incandescent lamps and fluorescent tubes. The portion of blue in LED is not different from the portion of blue in lamps using other technologies at the same color temperature. 

 A comparison of LED retrofit products to the traditional products they are intended to replace reveals that therisk levels are very similar and well within the uncritical range.

 Nevertheless, looking straight into bright, point‐like sources (LEDs, but also other strong point‐like light sources, like clear filament or discharge lamps and including the sun) should be prevented. However, when people happen to look into a bright light source accidentally, a natural protective reflex occurs (people instinctively close their eyes or look away from the source).

 It needs to be mentioned that blue light exposure is important to human beings. Blue light with a peak at around 460‐480nm regulates the biological clock, alertness and metabolic processes. In natural conditions, outdoor daylight fulfils this function. Yet, people spend most of the day indoors (offices etc.) and are often lacking the necessary blue light exposure. Blue and cool white light sources can be used to create lighting conditions such that people will receive their daily portion of blue light to keep their physiology in tune with the natural day‐night rhythm.

 Due to the highly flexible application possibilities, LED based light sources are particularly well suited for that purpose.

 The photochemical blue light hazard can be evaluated on the basis of the standard EN 62471. The latter classifies light sources into risk groups 0, 1, 2 and 3 (from 0 = no risk through to 3 = high risk). The sun would be classified as being in the highest risk group.

 Taking the 500 Lux criterion as the measurement basis, none of the LED products belongs to risk group 2.

 THIS WAS ALSO CONFIRMED BY A STUDY ON THE FRENCH AGENCY FOR FOOD, ENVIROMENTAL AND OCCUPATIONAL HEALTH & SAFETY (ANSES) IN 2010 WICH FOUND THAT EVEN HIGH-OUTPUT DISCRETE LEDS ARE CLASSIFIED INTO RISK GROUPS OF 0 OR 1 IF THE 500 LUX CRITERION IS APPLIED. 

 Ps: One method measures the distance at which an illuminance of 500 Lux is attained (a typical value for general lighting purposes). According to EN 62471, the 500 Lux criterion must be used for lamps intended for general lighting (including lamps for lighting offices, schools, homes, factories, roadways, or automobiles).

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LED compared to other light sources.
 With regard to photo biological safety, LED is not fundamentally different to lamps using traditional technologies, such as incandescent or fluorescent lamps. The portion of blue light in LED is not higher than.
 the portion of blue light in lamps using other technologies.
http://www.celma.org/archives/temp/CELMA-ELC_LED_WG(SM)011_ELC_CELMA_position_paper_optical_safety_LED_lighting_Final_1st_Edition_July2011.pdf