LED flashlight and ordinary light bulb difference
LED is a new type of flashlight, since the advent of white LED, it has been introduced, but the initial time due to low brightness white LED, high cost, it can be said that such products have been in the "laboratory stage", the price of ordinary people no one Dare to ask, some military products have a small amount of promotion. With the increase in the brightness of white LED, cost reduction, and gradually take the ranks of the public. The increase in brightness is mainly due to the emergence of ITO, the brightness is almost doubled, and the price, due to the improvement of production technology, from the initial 4 dollars down to the current 4 cents a cheap 1 cents below Many. Now the popular flashlight on the market with 9 or 12 diameter 5mm LED, the connection is parallel, 3 7 batteries. Or a 1W or 3W or 5W high power LED. 1W high power LED single device prices ranging from 15-35, the initial launch of lumileds 1W high power LED seems to sell 4-5 dollars.
Semiconductor lighting is known as the fourth generation of lighting, can be said to be a replacement product, cost much higher than ordinary light bulbs, but long life Energy-saving, ordinary light bulbs do not know how much, with LED flashlight about 1W-5W range, talk about energy-saving advantages, then put aside the flashlight, LED current market-oriented products in terms of energy consumption between incandescent and fluorescent lamps. But absolutely environmentally friendly, non-polluting. Long life, is the recognized advantages of LED, but the market can be said that the flashlight with LED can be mixed.
LED flashlight another fatal shortcomings (ordinary people are not easy to find the shortcomings), low color rendering index! In the LED display under the color of the incandescent lamp is not true, which from the spectral distribution of the analysis, are technical problems, without repeat. There is also a drawback, the spot, due to the white LED manufacturing process defects coupled with the reflective cup or lens with the error, likely to cause "yellow circle" problem.
LED flashlight lamp than the traditional signal has a clear advantage:
1. As the LED beam is forward and has a certain divergence angle, so you can not like the incandescent need to install reflective bowl. And the LED itself is issued by the shade, so there is no need to filter with colored light, to solve the false display and light distribution lens color drift problem, improve light utilization.
2. Long working life, 5 to 10 years, low maintenance costs. While the traditional lights need to replace 3 to 4 times a year, high maintenance costs. Of course, 5 to 10 years of life is a theoretical data, is based on LED single tube 100,000 hours of life to calculate, but in fact the LED lights due to poor working conditions, sun and rain, cold and heat, the LED life will inevitably affect The From the early installation of the use of LED lights currently use the situation, the early installation of LED lights are used in more than four years.
3. Power consumption is small, generally about only incandescent light source lights 10% to 20%. This is in line with the country's relevant energy policy.
4. Since a single LED is only a special light-emitting unit in the lamp panel, as long as the signal board design is reasonable, even if the individual LED burned, it will not affect other LED light-emitting unit, thus affecting the overall effect of the signal.
But the LED signal itself there are three special shortcomings:
1, as mentioned above due to the temperature rise caused by light intensity attenuation.
2, LED is actually a semiconductor PN junction, although its positive conduction voltage in a range, but different, this situation led to part of the LED can not work in the normal
3, LED prices are more expensive than incandescent lamp several times.