The working principle and characteristics of eye protection desk lamp
(1) White light similar to natural light, with stable brightness, no flickering, and no eye fatigue.
(2) The light-emitting area is large, and it is not easy to produce glare and large-area shadows that are harmful to eyesight.
(3) Instant bright spot, quiet and noiseless after lighting.
(4) Compared with ordinary incandescent lamps, it saves 80% of electricity, and the lamp can be ordered to run for more than 6,000 hours on average.
First, what is the “strobe” of the light?
Common light sources used in daily life such as incandescent lamps, fluorescent lamps, quartz lamps, etc. all use 220V/50Hz alternating current to work, that is, the positive and negative half cycles change 50 times per second, so As a result, the light flickers a total of 100 (50*2) times in 1 second, coupled with the instability of the mains voltage, the light flickers on and off, which produces the so-called “strobe”.
Second, what is the harm of the “strobe” of the light to the eyes?
Due to the change of light and shade, the visual system has to continuously adjust the pupil, and this adjustment process is more severe under the stroboscopic light source. Although this kind of flicker is not very obvious, but working and studying in this state for a long time, within a few hours, the pupil sphincter will be tense due to excessive movement, and the retina will also deposit harmful substances due to the imbalance of acid-base changes, causing eye fatigue. And then produce eye pain, dryness and other symptoms, the formation of pseudo-myopia. If you continue to use stroboscopic lights, the eyes are still in a state of fatigue, and pseudo-myopia will develop into true myopia, and finally develop into pathological myopia. Especially children’s eyes are in the stage of development and have great plasticity. The above phenomenon is obvious.
Third, why can the eye protection lamp eliminate eye fatigue caused by stroboscopic?
Eye protection lamp can eliminate eye fatigue caused by stroboscopic, It is because: (1) High-quality electronic frequency conversion rectifier is used to convert the 50HZ AC signal into tens of thousands of HZ high-frequency signals, and the phosphors are excited to emit light more than 40,000 times per second. After each time the fluorescent powder in the fluorescent tube is excited, the brightness is not attenuated for the second time. Therefore, continuous light with stable illuminance can be generated. (2) Using voltage stabilization technology, the AC power can be input in a wide range of 160V~260V. After special treatment of the circuit, the voltage across the input lamp tube remains basically unchanged, which can eliminate the sudden change caused by the voltage instability. Bright and dark phenomenon. Therefore, the eye protection lamp can completely eliminate the phenomenon of stroboscopic and flickering, thus eliminating the eye fatigue caused by stroboscopic.
Fourth, what is color temperature and color rendering?
Represented by absolute temperature K, it is the color when a standard black body is heated and the temperature is raised to a certain level. Starting from red-light red-orange-yellow-white-blue-white-blue, it gradually changes. Using the characteristics of this light color change, when the light color of a light source is the same as the light color presented by a black body at a certain temperature, we will use the black body at that time. The absolute temperature of the light source is called the color temperature of the light source.
The degree to which the light source shows the color of the illuminated object is called color rendering, which is the degree of color fidelity. The light source with high color rendering has better color reproducibility, and the color we see is also Closer to natural colors, light sources with low color rendering have poor color reproduction, and we see large color deviations.
5. Why does the eye protection lamp use a tricolor fluorescent tube with a color temperature of 4500~5000K? Why does the 4500~5000K tricolor fluorescent tube emit light close to natural light?
This is because fluorescent tubes with different color temperatures emit different colors of light. When the color temperature is below 3000K, the color will appear reddish, and when the color temperature exceeds 5000K, the color will appear bluish. The reddish or bluish light color will change the true color of the illuminated object (that is, the color deviation is large), so that the black and white contrast of the illuminated object will be reduced, resulting in a decline in the human eye’s ability to distinguish, so reading and writing work under this light source , in order to see clearly the content of the book can only develop the bad habit of looking forward, which will lead to the occurrence of myopia over time. The eye protection lamp adopts 4500K~5000K three primary color fluorescent tubes, which will not change the true color of the illuminated object, and the light color emitted makes the illuminated object lifelike, which is the ideal lighting source.
The sunlight in the morning and evening is reddish, and the sunlight at noon is dazzling, and their color temperatures are around 2500K and 7000K respectively. The sunlight around 10 o’clock in the morning is the softest and has the highest color rendering, which is most suitable for people to read and write. The light color emitted by the three-primary fluorescent tube with a color temperature of 4500K~5000K is just close to the sunlight at about 10 o’clock. Therefore, we call the light emitted by the 4500~5000K trichromatic fluorescent tube close to natural light.
6. Why is LED light a natural eye protection light?
What is an LED? LED, also known as light-emitting diode, is a semiconductor cold light source. The material uses gallium phosphide (GaP) and gallium arsenide (GaAs) group compound semiconductors. The light-emitting principle is to apply current to the semiconductor diode, through the combination of electrons and holes, The released energy is released in the form of light to achieve a luminous effect.
Stroboscopic and color rendering: Due to the light-emitting principle of LEDs, LED eye protection lamps are naturally free from stroboscopic. As long as the light intensity is sufficient, it is closer to natural light, and the brightness is stable, which is very helpful for the eyesight protection of students who are overuse.
Radiation: Since the LED lamp is a cold light source, not a fluorescent tube, there is no ultraviolet and infrared rays in the light, which eliminates the damage of such radiation to the eyes.
Energy saving: High efficiency and energy saving, low power. Low power consumption (2.5W) Calculated by using 4 hours a day, the electricity consumption for a month is only 0.3 degrees, while the electricity consumption of ordinary 60W incandescent lamps is 7.2 degrees, which can save 90%. (calculated at 0.6 yuan per kWh, saving 50 yuan a year)
Longevity: LED lights can work continuously for 100,000 hours.
