LED is a new type of flashlight, since the advent of white LED, had been pushed out, but at the beginning because of the brightness of the white LED is low, the cost is high, it can be said that the product has been in the laboratory stage, the high price of ordinary people and no one dare have a small part of the military on promotion. With the improvement of the brightness of white LED, reduce costs, and gradually go as the ranks of the masses. The brightness increased mainly due to the brightness of ITO, almost doubled the price, due to the improvement of the production process, from the initial 4 dollars a down to 4 cents a cheap 1 cents below the lot. Now popular on the market with 9 or 12 5mm diameter of the LED, the connection is connected in parallel, the power supply of the battery No. 3, section 7. Or 1 1W or 3W or 5W high power LED. 1W high power LED single device price ranging from 15-35, the initial launch of the Lumileds 1W high-power LED seems to sell $4-5.
Semiconductor lighting is known as the fourth generation light source, can be said to be a replacement product cost is much higher than the ordinary bulb flashlight, but long life. Such, do not know how much is the ordinary light bulb, LED flashlight ranging from about 1W-5W, and the energy saving advantage, put aside the flashlight, LED currently on the market of the products in terms of energy consumption between the incandescent lamp and fluorescent lamp. But absolutely environmentally friendly, no pollution. Long life, is recognized as the advantages of LED, but on the market by LED can be said to be uneven in quality.
Another fatal defect of LED flashlight (not easy to find the shortcomings of ordinary people), low color rendering index! In LED under the irradiation of incandescent color is not true, this is from the spectral distribution analysis, which belongs to the technical problem, not a repeat. There is also a drawback, spot, because of the white LED manufacturing process on its own defects coupled with the reflector cup or lens with the error, easy to cause yellow circle problem. Some manufacturers do not consider the quality of the device and with the problem, complete copy of the other products, the poor quality of the LED flashlight flooded the market, severely damaged the reputation of LED.