光量

光量	guāng liàng	quantity of light / luminosity
光	guāng	light; ray (CL:道) / bright; shiny / only; merely / used up; finished / to leave (a part of the body) uncovered
量	liáng	to measure
量	liàng	capacity / quantity / amount / to estimate / abbr. for 量词, classifier (in Chinese grammar) / measure word