白织灯亮度与电压有指数关系,了解一下白织灯基本数学原理对你是有帮助的

Incandescent lamps are very sensitive to changes in the supply voltage. These characteristics are of great practical and economic importance.
For a supply voltage V near the rated voltage of the lamp:
? Light output is approximately proportional to V 3.4
? Power consumption is approximately proportional to V 1.6
? Lifetime is approximately proportional to V ?16
? Color temperature is approximately proportional to V 0.42[94]
http://en.wikipedia.org/wiki/Incandescent_light_bulb#cite_note-GETP110-45
https://www.ies.org/PDF/100Papers/050.pdf