Led Reading Lamp For Bed

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FAQ

The service life of LED lamps and lanterns is true?
General lamp life 50000 hours, mainly depends on the service life of the power drive, the design of the ordinary not so long, but no electrolytic solution can be in fashion now.
LED lamp wattage? How much is the smallest biggest respectively?
Leds can be according to the power consumption, is divided into different power range, general individual has 0.1, 0.3, 0.5, 1, 3, 5, 10, 20, 30, 50, 100 tile, etc.,, if see now use leds, there are a lot of LED, depends on the wattage, etc.
LED bulbs can put in the desk lamp of adjustable brightness?
Can, see you what is the desk lamp of adjusting the brightness control
Long amount of brand of LED desk lamp capacitor charging Fried v100uf 50
This kind of LED desk lamp, 220 v power supply is to step down by means of capacitance current limit, once the no-load, after rectification voltage will be increased to 310 v, 220 v x under the square root of 2), seconds kill the capacitance of the withstand voltage 50 v. So this failure, you must first check whether the no-load and load of power supply circuit is normal battery, check the battery cables are broken, the charging current limiting resistor is burned, if these are no problem to check current limiting capacitance itself isn't breakdown (usually the breakdown causes 220 v over-current, empty trip meeting).
Why do some led desk lamp is white light, have a plenty of take a bit of blue?
With a little bit of blue is light; LED lighting is generally warm white, is white, cold white three color; Warm white, the color of light yellow, let the human look at warmer, solid said warm white. Warm white LED lamp light like a tungsten filament bulbs before that kind of color, can be used for household lighting. Is white, the color of the light color to white light gradually, but the color temperature of light color eye look more natural, reason is called white, also called natural white. Is the color of white light like a rod daily to the light, is also used for household lighting.
Led desk lamp and common desk lamp which is good
If the wavelength change, stimulate phosphor ability to drop, luminous efficiency will be lower. Manufacturers in order to pursue the brightness, usually to strengthen the blue LED light intensity, the eye if the long run, such a source to avoid eyes blue light damage. In addition, it is, the longer the LED light, the faster the phosphor decay of light source, the result will lead to the human eye contact blue wavelengths of light is more and more intense, so as to cause harm to the human eye
LED lamp in the 4 v lead-acid battery charging problem!
Dedicated charger generally 3 ~ 5 hours, about 200 ma small battery charging current, automatically stops charging. White led lamp voltage 3 v or so, so light is not on the discharge is lower than 3 v
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