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LED lamp, lens type and light type which good,
- Because of the high LED lamp brightness, focus, look into the LED lamp bead will be very dazzling. If you don't look straight into the LED lights, people's eyes, it is recommended to use a lens type, using planar light conversely.s
Students do homework with LED lamp to choose LED strips or LED lamp bead?
- Led strips and one of the led lamp bead. Common led two or four pins, there is no needle foot, close to the circuit board copper foil welding, are the same. You should choose lamp bead the key is to consider the color temperature, color rendering index, lights, light failure, and the power of good or bad, and so on.This do not have what distinction, be honest and see you turn on the light effect, such as soft soft, color is good, fever, instability, and so on. Don't be so fastidious that, as with two.s
Are LED lights compared to dc lights?
- Basically agree with net friend in front of the answer. The desk lamp of ordinary incandescent light bulbs with energy-saving lamps, bulbs and tubes in the current is an alternating current. Incandescent lamp current is ac mains, 50 hz, on and off the 100 times per second. Filament is high temperature heating, heat capacity to a certain extent, to cool and hot, stroboscopic was not obvious, but low light efficiency, energy saving. Energy-saving lamps, is the mains ac rectifier dc, again for the high frequency inverter (several thousand Hz) communication, energy saving, stroboscopic is not obvious, not like a normal fluorescent lamp. LED desk lamp, the energy conservation, but see, on the market at present basically is a built-in battery, use mains charging can't use the lamp, can light up from the mains before, often charging more than 6 hours, often should charge, so if used in a short time is can, such as to use for light continuously over a long period of time, is not convenient. LED flashlight, with short time, it is very good. If there is no battery, do not need to charge, it is more convenient. Above for your reference.s
The advantages and disadvantages of LED the desk lamp that shield an eye
- Suggest choose dc lamp At the moment there is a kind of complex light dc the lamp that shield an eye is good, with international patent. You can keep an eye on the lamp that shield an eye the lamp that shield an eye on market and other dc: one of the most essential difference between the high frequency the lamp that shield an eye (most of the domestic brand) : China's ac 50 hz, namely change 50 times per second. So direct use of alternating current (ac) electric light, are flashing, flashing frequency is commonly 100 times per second, is the grid frequency doubling, namely change 100 times per second. Other (international brand) : the lamp that shield an eye is high frequency variations of the lamp that shield an eye, not flash. Flash badly to the human eye can't see or added a filter, take temporary solution not effect a permanent cure. LED lights: not the lamp that shield an eye. LED energy-saving lamp tube is clean and healthy, but not the real meaning of the lamp that shield an eye. The first: the lamp that shield an eye is trichromatic lamp, light color is very good; And the LED is a monochromatic light source, can have influence on the color of the eye nerve, fatigue. Although its working voltage of direct current (dc), there is no flicker problem, but because of the LED chromatography is too narrow, can't use in the place with high demand with the eye, can only be applied to general auxiliary lighting (used in exterior lighting, light boxes, etc.). Second: the lamp that shield an eye is a special fluorescent tube; LED is a semiconductor light emitting diode. Dc the lamp that shield an eye: the alternating current into direct current (dc), first with dc lamps (high technical content), no flash, no stroboscopic, real and when using the light close to natural light, very bright, but not dazzling, very soft. And other kinds of electromagnetic radiation, more the lamp that shield an eye without any radiation. Of course the price will not low.s
Led rechargeable lamp, charging is completed, charging indicator light color?
- There are two kinds of lamp battery: Lithium battery charge with mobile phone charge, same instructions filled with red light turns green said, such as no charging indicator can only refer to the instructions. Lead-acid batteries used in dozens of pieces of low-grade called students or children desk lamp, rechargeable light most of the products will not change color, usually from a few hours to ten hours. Lead-acid battery charging requirement after filled with a floating time state, with the changed the user capacity and circuit design is difficult to grasp, because charging time short, filling is too long to form a rechargeable battery life shortened, theonly low-grade products without charging protection circuit, only carefully study the product description. Rough judgment: try every half hour after 2 hours filling light observation (do not charge while light), and if no longer increases should be full of light is the brightest and desk lamp brightness, floating charge time same again cans
Children lamp good choice led lamp is better
- Use LED lamp is better. Save electricity, no flash, the light is downy. General energy-saving lamps such as uv radiation, and there will be a stroboscopic.. LED there is no such as uv radiation, there is no stroboscopic, longer life, count was more stable, and quick response.s
Folding LED touch lamp generally will be problematic
- This topic is not answer, because the LED control method are many, and the way of touch also many, control way is very much also, only from the basic principles. Caused by electric current is the main reason for the failure of light, at the same time, the LED lamps and lanterns has typical characteristics of diode (very small voltage variation, huge current change) so, LED lights control method based on current control is the best, since it is control cannot use constant current source, but to use can control constant current source. In controllable constant current source, a switch type and linear type, because the switch type is inductance as the main device, and a sharp tuning switch frequency will cause many problems, it is easy to damage the leds, controllable linear constant current source is low efficiency, but the problem is less easy to implement.s
Amount for the LED - 666 desk lamp can use charging time
- Strictly speaking, it is best not to use when charging. Because: 1. Easy to get an electric shock. 1. Affect the service life of the product. Charging desk lamp is with leds (Light EmittingDiode) the desk lamp of the light-emitting diode as Light source, with lithium battery and USB charging function, the LED is a solid-state semiconductor devices, it can be directly put DianZhuan into Light. USB charging desk lamp is a desktop or laptop computer USB mini rechargeable lamps. Is through the computer connected to the computer USB interface, downy light, most of the charging desk lamp can adjust the brightness of the light, two control as you need to change, is very convenient. The USB port on the computer (that is, everyone is used to insert USB interface) for external voltage of 5 v power supply for the equipment, the current 500 ma, USB charging small desk lamp of desk lamp is with USB interface to provide power supply, lamp take up the space is not too much, and very save electricity, suitable for office workers or students. maintenance Household appliances maintenance led rechargeable lamps? Many users haven't noticed that some users will be LED rechargeable lamp is like electricity used up until then recharging it when you are going to use it. LED rechargeable lamp light life is compared commonly, if it is not because the excess voltage or short circuit, usually don't burn out.s
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