25w tungsten lamp with 12w energy saving lamp which bright
12W energy-saving lamps light efficiency is generally 60lm / w, so 12W energy-saving lamps luminous flux is 12 * 60 = 720lm
25W tungsten lamp light efficiency is generally not more than 20lm / w, so 25W tungsten light flux is 25 * 20 = 500lm;
12W energy-saving lamps are brighter than 25W tungsten filament lamps. To determine which "light" can be judged by the luminous flux of the lamp
So the light from the light emitted by the point of view, 12W energy-saving lamps brighter
