High Intensity Desk Lamp

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FAQ

Led lamp is broken. Who knows what reason be? How to repair?

You want to turn the light down, take a photo, to tell you how to fix, too many kinds of LED lamps and lanterns, each have each way, this phenomenon is usually light bead is broken

Card lamp, LED desk lamp can take a plane

Look at the battery storage is not too large should be ok

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

With photosensitive components after sampling the operational amplifier amplification, then send the feedback signal input terminal of the PWM controller, light to adjust the sensitivity of the feedback signal strength by adjusting the op-amp magnification (resistance), no need for A/D converter and SCM, that is too complex, workload big cost is high. A photosensitive diode, an op-amp, a PWM controller (e.g., UC3843), plus a few resistance capacitance inductance, there are ten yuan or so.

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.

sk next incandescent lamp, led lamps and halogen lamps have what distinction, which better

So only the halogen lamp, but is low voltage halogen lamp, need a rectifier, and halogen lamp itself temperature is high, pay attention to the heat dissipation, color rendering index selected 90-100, color WenXuan 2700 k, the best for you.

Led the desk lamp that shield an eye how to choose?

Eye protection is our life lessons, eye to start at a young age. Students in rapid growth stage, the body should protect the pair of the window to the soul. Eye can reflect on a lot of details, the lamp that shield an eye can greatly alleviate eye fatigue, protect your eyes from harm. The lamp that shield an eye is not adjust light brightness, who can adjust the brightness of the lamp that shield an eye eye function. Is the price is more expensive than ordinary ordinary incandescent bulbs. The lamp that shield an eye lamp luminous color temperature value determines the degree of light is downy, high and low are not good, is suitable for 4000 k to 5200 k. The lamp that shield an eye of 4000 k to 4500 k, the light is slightly red, more soft, suitable for primary school students; And 4500 k to 5200 k color temperature value is suitable for middle school students and its older customers to use. There is good, had better choose light yellow lights for under the yellow light will feel soft and comfortable to read and write, by reading in white, for a long time will feel sore eyes. The choice of the desk lamp that shield an eye still depends on the brand, good brand of the lamp that shield an eye quality guaranteed, the quality is qualified through inspection

Children lamp good choice led lamp is better

Light yellow color choice, because yellow is the most natural of incandescent lamp, filament light, an electric current passes through the great filament resistance filament become warm glow. Such light is continuous, no flash frequency. And white light is known as fluorescent lights from energy-saving fluorescent lamp, etc. Energy-saving lamps and fluorescent light stimulate phosphor luminescence principle is to use some kind of radiation, like light is discontinuous, which is a seaside sparkle, but quickly, eyes have a vision for the role of, feel the light in a flash. In such a light for a long time is bad for your eyes.

How to distinguish whether the led lamps and lanterns glare, is there a standard?

Glare can be divided into disability glare and arrow glare. Who reduce eye glare called a disability glare, it will be Reduce the visibility of the visual object, but not necessarily produce uncomfortable feelings; Who make the person produces the feeling of displeasure glare is called no Comfortable and glare. Cause glare of led lamps and lanterns has the following four major factors. (1) the light source brightness factor: the higher brightness, glare, the more significant. (2) light source location factor: the closer it gets to the line of sight, glare, the more significant. (3) the light source appearance size and number of factors: the apparent area, the greater the number of light sources, the more the glare, the more significant. (4) the surrounding environmental factors: environment brightness is dark, eyes adapt to lower brightness, glare also becomes more significant. Dazzling light not light, but for the concept of lamps and lanterns. Leds - t8 fluorescent lamp has been rise, are alternative Fluorescent lamp market, due to the lamps and lanterns is ready, can't change, leds - t8 fluorescent lamp needs to ordinary fluorescent effect Fruit near, thus formed the concept of glare. Anti glare products, need to consider the brightness of the led, led between the row Cloth, spacing, the led itself to the distance of the optical cover, the shape of the optical cover, light transmittance, etc., rather than simple Shell or configuration problem.