光量，光能
1. 光量：quantity of information 信息量 | quantity of light 光量 | quantity of motion 动量
2. 光量=>光量：quantity of information ==> 信息量 | quantity of light ==> 光量=>光量 | quantity of magnetism ==> 磁量=>磁気量
1. The lampshade and the panel can be freely rotated to adjust the quantity of light.