蓝光TUV测试方法和标准.pdf

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Low Blue Light Content Methode 1&2 11/14/2016

• Background of Blue Light  Being useful most of times, light / radiation also has its hidden dangers. A very well-known example is the “sun-burn”.  Depending on the “light-colour” typically different hazard levels can be associated. While in range from red to infrared the danger to the human body is comparably small, the same energy levels in the blue and Ultraviolet light range can cause harm to skin or eye.  Even when not being able to cause physical harm to eye or skin, light colours are able to impact our psyche as can be seen on the day and night rhythm (circadian rhythm).

• Blue Light in Display Products Why a Low Blue Light certification mark? Example: Behavior of a software for Android Mobile Phones claiming to reduce blue in % 80% 70% 60% 50% 40% 30% 20% 0% 0% 20% 40% 60% 80% 100% 0% 20% 40% 60% 80% 100% 250 200 150 100 50 0 ] ² m / d c [ e c n a n m u L i claimed blue decrease measured Luminance 80% 70% 60% 50% 40% 30% 20% 0% 10000 8000 6000 4000 2000 0 ] K [ e r u t a r e p m e T r u o o C l claimed blue decrease CCT NIST

• Requirements  Prerequisite-safety The product must be safe under foreseeable use and misuse conditions (e.g. electrically or mechanically) Ideally a TÜV Rheinland GS-mark or a local mark of a NCB

• Requirements  Low Blue light explanation In the user-manual the meaning of low blue light content has to be explained and they correctness of this claim is confirmed  Easy access The Low Blue light mode of a product has to be easily accessible. This can be achieved either by default mode or operation of a single button without entering further menus  Photo-biological Safety The product must meet exempt group limits as laid down in EN 62471  No UV-Content In the wavelength range from below 380nm, the product shall not emit radiation (neither UVA, UVB nor UVC)

• Requirements Ratio Blue light to luminance level In a band with a bandwidth of +-20nm next to the blue peak a maximum of 20% of power of the whole spectrum are allowed to be emitted. Ratio Blue to Green Ratio The Blue peak is not allowed to be more than double as high as the highest peak in other color range. < 50% Failed Example 452nm Blue Peak: 542nm Not Blue Peak: 23.1% Flux 20nm Band: Flux Ratio Blue to not Blue: 40.0%

Method 2  Due to technological changes a revision of the 2PfG Low Blue Light content become necessary.  The following pages describe the added method 2 7 11/14/2016 Martin Eichenseder

Reason for LBL method 2  Studies (see reference [1] and [2]) on rats have shown that blue light in a so called toxic wavelength range of 415nm to 455nm generated the greatest phototoxic risk to retinal pigment epithelium cells [1].  Photoreceptor cell apoptosis is seen early after the retina is damaged by blue light … provides a key to disclosing the basis of photoreceptor dell death in photic injury by blue light and opens the possibility of intervention in its process [2]. 8 11/14/2016 Martin Eichenseder

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