Ordinary light bulbs are heat radiation sources. Generally speaking, they emit light by burning themselves. Therefore, the tungsten filament of the bulb we usually use is obviously thinner after one year than when we just bought it, because of the loss. In the burning process of light bulb, a large part of energy is converted into heat energy, which can not be well converted into light energy.

Energy-saving lamp belongs to low-pressure gas discharge lamp, which is a way of exciting ions by arc discharge to generate ultraviolet rays, and then exciting phosphor discharge by ultraviolet rays.

Because it is an electronic discharge, it will not generate too much heat energy in the process of discharge, but try to convert energy into light energy, which is why low-power energy-saving lamps are brighter than high-power bulbs.

Energy-saving lamps are much more difficult to manufacture and realize than ordinary light bulbs, so the corresponding price will be higher than ordinary light bulbs.