1.DC fluorescent lamp: DC fluorescent lamp uses DC ballast to convert alternating current into DC with stable voltage and current. Fluorescent lamp can realize non-stroboscopic, soft and continuous light emission, which can alleviate visual fatigue and solve the problem of stroboscopic of fluorescent lamp with inductance ballast. In addition, because DC technology has no AC fluctuation, it also avoids the problem of high frequency.
Second, LED lights: LED lights have three color temperatures: warm white, positive white and cold white, and cold white LED lights will be more dazzling. LED lamps are mainly suitable for occasions that require large-scale landscape lighting and the light quality is not high, and are not suitable for environments that require high eyes, because LEDs contain a large proportion of blue light components, which is easy to hurt eyes. In addition, the beads of LED lamps have the problem of attenuation rate and are easy to wear, which may lead to the scrapping of table lamps. Moreover, LED is a monochromatic light source with small luminous area and narrow color spectrum, which will affect the optic nerve. The electronic components of LED desk lamp are low in cost, and the price of desk lamp is relatively cheap.
Third, high-frequency lamps: fluorescent lamps and energy-saving lamps use high-frequency electronic ballasts, and the strobe frequency can be as high as 30.
50kHz, the phosphor has
Afterglow effect
So the human eye can't perceive stroboscopic at all.
4. Electric lamp: The spectrum of ordinary incandescent lamp and halogen lamp is continuous, which is the light closest to the natural spectrum, so it is also a kind of eye protection lamp. Moreover, because the alternating current heats the filament first, the filament emits light after heating up, and the filament has heat capacity, so when the power supply changes, the filament is still hot, and the degree of light and shade change is not as obvious as that of fluorescent lamps. However, incandescent lamps have gradually withdrawn from the market because of their low energy efficiency.
Working principle of eye protection desk lamp
There are two main types of eye protection desk lamps according to their working principles. One is to change the strobe frequency of the desk lamp, and the other is to change the current type of the desk lamp.
At present, the working principle of most eye protection desk lamps on the market is to improve the low-frequency flash to the high-frequency flash. This eye protection desk lamp adopts frequency conversion electronic ballast, which increases the electric frequency from 50Hz to 5500Hz to reduce the stroboscopic effect, and adopts tricolor phosphor to reduce the glare effect, which makes the light soft and not harsh, which makes people feel uncomfortable with stroboscopic, thus reducing visual fatigue. Stroboscopic effect is a test index of all fluorescent tubes. The less stroboscopic, the better the lighting effect.
Eye protection lamps are rare. The working principle is to first change alternating current into direct current, and then the lamp with direct current will not flash at all, so as to achieve true no stroboscopic. Moreover, when in use, the light is close to natural light, bright, but not dazzling at all, very soft, which greatly relieves visual fatigue. Compared with other kinds of eye protection lamps, electromagnetic radiation has no radiation. The related technology of DC eye protection desk lamp has passed the patent certification granted by China National Intellectual Property Administration. Of course, compared with the previous eye protection desk lamp, the price is much more expensive and the technical content is high.
Matters needing attention in purchasing eye protection desk lamp
First, pay attention to the use of eye protection desk lamps.
The use of eye protection desk lamp should be simple, and the lamp holder must be replaceable. It is best to use common standard interfaces, such as E27- coarse lamp holder and E 14- fine lamp holder, to ensure that the lamp holder can be replaced when it is damaged.
Second, check the relevant documents of eye protection desk lamp.
Pay attention to check the relevant certificates of products when purchasing. The certificate of conformity and safety certification should be complete, and there should be mandatory national safety certification.
3C
Certification mark.
Third, pay attention to the light of the eye protection desk lamp.
Generally qualified eye protection desk lamps should have stable and uniform brightness, no stroboscopic light, soft light and no glare, reasonable lampshade design and no glare.
Fourth, pay attention to after-sales service, and be sure to mark the maintenance address and telephone number.