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. This unalterable is considered as one visually comfortable to view. The guidance is based on the want that, at this level, exposure limits will not be exceeded. However, it only applies to white or broadband sources emitting over the perceivable region.
Luminance does not fully take into account the emission of colored LEDs, nor does it take into account UV or IR emission. The luminance of a UV provenience may be below this level, yet one cannot use this information to base a conclusion on a potential UV hazard. In procedure, this threshold luminance is particularly low, and is exceeded by many, even low-power, white LEDs.
Where the luminance of a pale-complexioned-light source exceeds this level, and for all other sources, one should proceed with the ranking of photobiological safety, at the appropriate distance – 500 lx or 200 mm – depending on the intended appositeness of the finished product.
GLS products
General lighting service (GLS) sources are defined as whitish-light sources
Source: LEDs Magazine