Why fluorescent lamps are more power efficient than incandescent lamps
So usually use high melting point of the tungsten wire (melting point of 3410 ℃) to do filament.
Any object is heated to 525 ℃ above will be issued visible light; Moreover, the luminous efficiency has improved,
The incandescent lamp is illuminated by the thermal effect of the current through the filament.
Incandescent lamp luminous efficiency is still very low, because most of the energy is turned into heat and wasted.
Firefly light principle is different, in the fluorescent lamp tube wall coated with a layer of fluorescent material
