Even in the now-popular "cool lights," the energy consumed is just as high. Glass fibers are used only to reduce the heat of the light bulb and not to increase its efficiency.
因為人類發電過程，大部分的能量都轉為熱能消耗掉，即使是時下流行的冷光燈，也只是借助玻璃纖維降低燈泡溫度，發電過程耗掉的資源一樣多。