CONSIDERATION ON SAFETY FACTORS APPLIED TO A SIMPLIFIED APPRAOCH TO EVALUATE BLUE LIGHT HAZARD OF GENERAL LIGHT SOURCES BY MEANS OF PHOTOMETRY

摘要

Potential problem on the evaluation of blue light hazard (BLH) using the photometric data was evaluated based on a computer-simulation analysis. It is found that variation of K_(B,v) values of simulated white sources comprising three LEDs with different peak wavelength and bandwidth are often beyond the currently-defined safety factor for the sources with lower CCT, and smaller variation of K_(B,v) can be expected for those with higher CCT. Based on the general tendency of K_(B,v) variation depending on the CCT of the sources, reasonable d_(uv) range for white sources to be targeted is estimated, and a mathematical modelling, CCT-dependent safety factors and corresponded simplified threshold luminance table are proposed and discussed to improve the BLH risk estimation by means of photometry.