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- The principle of LED the desk lamp that shield an eye
- The LED similar principle. But the difference is that the LED is not by the electrons within the atoms jump to glow, but by the voltage on the LED on both ends of the PN junction, the PN junction itself form a level (in fact, is a series of energy levels), and then the electrons jump on this level and photon to glow. New LED display units are low power consumption, high brightness, long life, the advantages of small size, this article from the beginning of the LED display a brief history of the development of, surface-mount LED, automobile application is discussed and the development trend of LED lighting, LED to the Chinese engineers engaged in the development of display device has a certain reference value. Global the first commercial light emitting diode (LED) is made with germanium materials in 1965, its unit price is $45. In 1968, the LED research and development has made breakthrough progress, using nitrogen doping process to make GaAsP device efficiency reached 1 lumens/watt, and can emit red light, orange light and yellow light. To 1971, the industry and introduced with the same efficiency GaP green bare chip LED. Beginning in 1972 with a small amount of LED display for clock and calculator. The world's first using LED watch was initially sold in expensive jewelry store, it will cost up to $2100. Almost at the same time, HP and Texas instruments have also launched calculator with seven red LED display. In the 1970 s, due to the LED devices in the home and office equipment in a large number of applications, LED prices plummeting. In fact, the LED is the era's main text display and digital technology. However, in many commercial equipment, LED display also gradually by the fierce competition from other display technologies, such as LCD, plasma and vacuum fluorescent display.
- Led rechargeable lamp, charging is completed, charging indicator light color?
- What color is your watch before charging, then ran a period of time under observation to know, most of them are will change color. Lattice nita, photoelectric
- I'm doing a LED desk lamp, can be through the outside light intensity automatically adjust the brightness of LED, using PWM technology, how to do excuse me
- A photosensitive diode, followed by current - voltage conversion and amplifying circuit, and then sent to the AD converter, into a digital signal, for single chip microcomputer. Single-chip microcomputer according to the amplitude to send a PWM control signal to the pulse width control chip.
- sk next incandescent lamp, led lamps and halogen lamps have what distinction, which better
- The LED desk lamp is not, is not good for you and your children, so, cannot use LED lamp; Incandescent bulbs, as a result of energy saving, the country has banned the use of incandescent lamp, although there are on the market at present sell incandescent bulbs, but also a few businessmen in order to reduce the loss and discounted in clearance, also not suitable for you use;
- Long amount of brand of LED desk lamp capacitor charging Fried v100uf 50
- Resistance is replaced This desk lamp should be used on the 24 v power supply
- How to repair the led rechargeable small desk lamp
- All is bright or not bright? If it is not all bright, check the input part is whether links of control circuit of rechargeable batteries and short circuit or open circuit;
- High-power LED the lamp that shield an eye more appropriate
- and to achieve the same intensity of illumination, white the most power-hungry, definite lamp is about three to five times the size of energy-saving lamps, LED the five to eight times. LED as its light Angle is not close to 360 degrees, under the same power, in the direction of the LED light, LED has the highest intensity of illumination, for example, if you use a 9-11 w lamp, LED lights do you completely can also use a 11-15 w energy-saving lamp as a desk lamp. Energy-saving lamps - LED 4 w power consumption calculation, turn on the light for five hours a day, continuous use of more than 50 days 1 KWH, a year only 7 degrees, 0.5 yuan per degree, only 3.5 yuan a year, but harm to your eyesight smaller, compared with 60-80 w white lamp code,
- Whether the LED desk lamp, luminous points: two guide plate and the patch?
- LED lamps light source generally have patch light, into the light, and power source, there is also a surface light source. But more popular on the market at present is made of tiles and is by the desk lamp of light after diffusion of light guide plate, so the light will be soft not dazzling! But no matter what kind of light source, LED desk lamp is not main lamp power supply shall be without stroboscopic is the most important thing, is good for your eyes desk lamp. Because whatever the source, as long as meet the function of the lamp lighting the reading, the second function is to protect his eyes.