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FAQ

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.

What kind of light the lamp that shield an eye?

The desk lamp, LED is better, although it will still more expensive than energy-saving lamp or the light bulb, but value: the choice of the LED to have the following key points: first, to see the shape of the LED lamp bead, must be patch (that is, a piece of aluminum substrate has a lot of square yellow dots), if the little lamp bead is spherical or several high-power lamp bead, decisively abandoned, because those are the old, bad for your eyes, just before the LED haven't rolling development to the mature technology;

New LED small rechargeable lamps filled with electricity or running

First power consumption, basically see your battery is what material, have the ability to remember. If nickel-chromium batteries will be used up first, then charge, you can't have the to lithium ion.

I want to ask to buy what kind of bulb to eyes good, leds? How many watts

220 v to 12 v may not use resistor step-down, so efficiency is very low and the resistance of consumed power is very big (18 times reached the bulb power), the original circuit could be a 220 v variable or a 12 v transformer AC - DC devices.

Do leds have ultraviolet radiation

LED is characterized by single band, the wavelengths are generally above is 390 nm, uv to less than 380 nm, so there is no uv components

I want to buy a charging desk lamp, LED lamp brightness seems a bit low, if it is a 13 w the lamp that shield an eye brightness LED small bulb, how many is needed to achieve the same brightness?? Have LED to the eyes good yao I to a charge of desk lamp, thank you

Pro. If an ordinary lamp what LED bulb lamp? At present all the desk lamp of light source (with the lamp body separation) are all common desk lamp, and its applicability is can be replaced any type of light source, including LED, and class integrated light source (lamp and light source not change) in theory the obvious advantages of LED, but in mainland China LED desk lamp is filled with a lot of bad product shoddy, that you might as well buy ordinary, should be relatively common desk lamp is cheap, and the light source is easy to change.

The advantages and disadvantages of LED the desk lamp that shield an eye

4) monochromatic light source, chromatography is too narrow, can have influence on the eyes of the optic nerve, fatigue Small (5) the LED lamp bead, loss of a few years later will slowly to change, easy to cause the whole lamp scrap (6) basic color temperature is above 5000 k, pure white is very bright, more dazzling (7) LED the lamp that shield an eye with poor workmanship will produce slight stroboscopic and radiation.

How many watts of led the desk lamp that shield an eye with good students

LED lamp general 6/7 w is very bright, is too light is bad for your eyes.Have a personal 11 18 w