Abstract
Using light emitting diodes (LEDs) as a light source for lighting has been increasing in the 21 century. It has become necessary to prepare safety standard before the problem will occur. Commission Internationale de l'Eclairage (CIE), International Electrotechnical Commission and Japanese Industrial Standards Committee already prepared safety standard or technical standard of lights and lighting systems including LEDs. However, there are many problems of the optical radiometry of LEDs, and unknown effects of non-visual physiological reaction induced by irradiation using LEDs. This paper describes these problems and future works.
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