Chinese name
Eye protection lamp
function
protect eyes
superiority
Power saving, healthy eye protection, no blue light.
colour temperature
< 4000 k at night
Principle classification
Myopia eye protection lamp
The myopia eye protection desk lamp adopts blue light and ultraviolet isolation technology, and the color rendering index is above 94. [ 1]
filament lamp
The earliest incandescent lamps and halogen lamps were heated by alternating current through the filament, thus re-emitting. Because the filament has heat capacity, when the power supply current changes, the temperature of the filament changes little, and the brightness of the light emitted will not change as obviously as that of a fluorescent lamp, but it also has its shortcomings. The service life of light bulbs is generally less than 65,438+0,000 hours. In addition, incandescent lamps and halogen lamps are characterized by continuous spectrum, which is their advantage over other electric light sources.
There is also a filament with large heat capacity. Judging the heat capacity of filament can be seen intuitively: after turning on the light, the light will light up slowly, that is, the heat capacity is large; It is bright when it is turned on, and its heat capacity is small. This kind of eye protection lamp using filament with large heat capacity often has two stages. Turn on the low-grade filament first, then the high-grade filament. In normal use, using two-stage heating filament can effectively prolong the service life.
Ordinary incandescent lamps have good spectral characteristics, but due to low energy efficiency, incandescent lamps over 60W have been listed as obsolete commodities by the state [2]. Halogen lamps have higher filament temperature and slightly higher energy efficiency than incandescent lamps. Halogen lamps are widely used in automobile headlights, hotels, auditoriums and telephone booths because of their low color temperature and yellow color.
High frequency lamp.