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Low voltage LED desk lamp belongs to the scope of 3 c certification
Low voltage LED lamp -- -- -- -- -- is 220 v electricity, or the battery? Pick up the 220 v power will have to do the CCC certification
Need to solve the problem of the LED light flashing
Problem in the connection on the way, I guess you're mistaking 40 simple lamp bead is divided into 10 road, every 4 star all the way, so directly in parallel on the 12 v is? First answer me how do you connect again to teach you.
How many volts 4 w power led desk lamp
Depends on what kind of, have 220 v, also has a charging V6, 12 v.
Heard that LED save electricity, to follow the fashion, a grind, spent more than three hundred bought 6 LED bulbs, but less than 3 months finished bad, all manufacturers attitude can also, all changed, but also bad, depressed.
You choose the wrong factory, general theory of LED life span is 50000 hours, the actual use also in 35000 hours. Three months is bad, is basically not well-known chip in China. Now we are doing the LED business, foreign customers require minimum is Taiwan wafer chips, and some domestic retailers order chips are the most time, because Chinese people cheat, also bad complaints after seduced. Don't mind the price to buy the philips, their quality must be guaranteed. The good and evil people mixed up domestic factory, see you luck
LED rechargeable lamp, battery voltage is how many v?
The working voltage of LED (light-emitting diode) on different materials are different. Ordinary do remind instructions with phosphorus gallium arsenide material in between 1.55 V - 1.85 V; Gallium nitride material in 1.85 V - 2.15 V, the LED is red, green, yellow, orange glow (double color LED a variety of colors to choose from. General working current is very small, about 5-10 ma (0.005 0.010 A) A -- -- -- -- --, the brightness is not very high, can not be used for lighting. Using is a kind of super high brightness LED flashlight, its working voltage is higher, generally 3.35 V - 3.65 V, working current is relatively large, at 30 ma -- -- -- -- -- 50 ma, high brightness. Above is reproduced, the following is what I write. You can also in the baidu search is known here.
LED lamp base fever is normal
Some adopts stabilized voltage supply drive leds, regulated power supply power design is critical, no allowance, also get hot. Should be choose the calorific value of the smaller good drive and regulated power supply, is more advantageous.
sk next incandescent lamp, led lamps and halogen lamps have what distinction, which better
See you use, such as the most used to painting so you can only choose halogen (trichromatic fluorescent lamps also do, but the color is feeling less). General reading, ordinary fluorescent desk work, more money and don't care about environmental problems can buy dc lamp (dc except inefficient and communication than no advantage, use dc, the polar bear's death also have a credit for you!) . Special care about environmental protection and main for night light use you can use the leds
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.