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FAQ
- The led lamp charging more than 24 hours have what dangerous?????
- Authentic qualified desk lamp, the battery charging protection circuit for battery will not overcharge, adequate electricity stopped. He was afraid the streets or other simple knockoffs, charge for a long time is important for battery life.
- LED desk lamp, very bright, when buy later with more and more dark
- Rechargeable table lamp is power off. Perhaps others with bad throw to sell goods pick up on sale. Second hand.
- 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
- LED lamp with a constant current source control, add a photoresistor adjust current source circuit; PWM control, it is not necessary to make it too complicated, say little and a few watts
- 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
- When did you buy? If it is just bought, suggest you use first photoelectric charge again
- ?the progress of the halogen lamp is incandescent lamp, full of halogen gas in vacuum bubble has realized the halogen tungsten filament with gas circulation and greatly prolong the service life of the filament, perfect inherited the color rendering of the incandescent light bulb 2, energy-saving lamps, CFL (compact fluorescent lamps, the actual domestic called the lamp energy-saving lamps have a little not science...). CFL is a great invention, the field of electric light source characteristics can be made into any color temperature and high color rendering, due to the effect of glow of the phosphor powder, stroboscopic can ignore (low temperature is a problem). Advantage is high luminous efficiency, such as 11 w CFLS can completely replace 60 w incandescent lamp, and use tricolor phosphors CFLS can reach more than 80 color rendering, some high-end products can reach more than 90 The disadvantage is that the fluorescent tube is filled with mercury vapour, how to environmental protection is a big problem in manufacturing and recycling, partly responsible manufacturer in tube using mercury pills (haha, suspected of advertising), partly solved this problem... P. : energy-efficient light bulbs are more likely to buy on the market at present stage is cost-effective light source
- LED lamp circuit of current more conference appear what problem
- Will first fever, if it is too big, can burn out directly. On the issue of the lights, string, and, have a plenty of string and share
- What if the led lamp doesn't shine
- If it is a line break have to pick up, if there is black spots is the LED surface that is was burnt out, that is about to change the LED. Many of the LED circuit adopts the series circuit, that is to say an LED bad throughout the series circuit will not bright. Generally LED not easy bad, usually a transformer is the most easy to bad. Open it and see it
- How to repair the led rechargeable small desk lamp
- The cause of the damage may have three, the first wire solder joints from or switch contact bad, you carefully check each except; The second is lead-acid battery damage can't charge; The third line fault is charging, the charger for capacitance, rectifier diode, resistor, the most easily broken is the capacitance, then inspect diode. If you didn't have electrical knowledge, please do not repair, in order to avoid dangerous.
