The principle of "eye protection lamp": ① The frequency conversion electronic ballast is adopted to increase the electric frequency from 50Hz to 30-50kHz, and the variation amplitude of light brightness is very small due to the afterglow effect of fluorescent powder, so the human eye can hardly feel stroboscopic. Meanwhile, the tricolor fluorescent powder is used to make the light soft, so as to reduce the visual fatigue. (2) Using DC ballast, the alternating current is changed into direct current first, and the direct current is used to light the lamp, so that there is basically no stroboscopic light, which can avoid visual fatigue and no electromagnetic interference.
Matters needing attention:
First, the brightness of the irradiated target area should be appropriate. It should be pointed out that different eye conditions (such as general activities, bedside leisure reading, and writing reading) have different requirements for light brightness and uniformity, and there are detailed numerical regulations for this in the national standard. However, the types, powers, and shapes of light sources used in table lamps vary widely. Users must adjust the position and irradiation angle of the light sources according to the actual situation, so that the brightness of the light in the target area can meet the requirements of the national standard. Generally speaking, because the visual light brightness is subjective and has a large deviation, when adjusting the light, we should use the brightness monitoring tools such as eye protection luminosity pen. This is especially important for long-term and close-range use of eyes (such as reading/writing).
Second, avoid dazzling lamp head glare and reflection of irradiated surface. For ordinary indoor lighting (such as roof lights), there are generally no such problems. However, for table lamps, glare at the lamp head and reflection of the irradiated surface are very common. Dazzling glare and reflection are obviously harmful to eyes. Users can avoid the glare of the lamp holder and the reflection of the irradiated surface by adjusting the irradiation position and angle of the lamp holder. Generally, it can be done by visual inspection.
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