Ordinary incandescent lamps are actually an eye-protection lamp. Because the alternating current heats the filament first, the filament heats up and then illuminates. Because the filament has a heat capacity, the filament is still hot when the power source changes, and the light and dark changes are not as intense as fluorescent lamps (fluorescent lamps).
Thus, there is an eye-protecting lamp that uses a filament having a large heat capacity.
Judging the heat capacity of the filament can be visually observed: after the lamp is turned on, the lamp is slowly lit up, that is, the heat capacity is large; when it is turned on, the heat capacity is small.
This kind of eye-protecting lamp that uses a filament with a large heat capacity often has two gears, firstly opening the low-end heating filament, and then opening the high-grade, normal use. Because when the light is turned on, the filament is not too hot, the current will be relatively large, the filament is easy to burn, the life of the bulb is not long, the filament is heated first by two steps, and then the high-grade normal illumination is opened, which can effectively extend the service life.
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