相对亮度 meaning in Chinese

lumen fraction
relative brightness

Test methods of rare earth three - band phosphors for fluorescent lamps - determination of relative brightness
灯用稀土三基色荧光粉试验方法相对亮度测定
Guidelines for the elderly and people with disabilities - visual signs and displays - specification of age - related relative luminance and its use in assessment of light
老年人和残疾人用指南.视觉标牌及显示器.与年龄有关的相对亮度规范及其在光线评估中的使用