In order to explain the characteristics of white LED, take a look at the status of the light source used. Incandescent and halogen lamps, the light efficiency of 12 to 24 lumens / watt; fluorescent lamps and HID lamp light efficiency of 50 to 120 lumens / watt. White LED: In 1998, white LED light efficiency of only 5 lumens / watt, in 1999 has reached 15 lumens / watt, this indicator is similar to the average household incandescent lamp, and in 2000, the white LED light efficiency Reached 25 lm / W, this indicator is similar to halogen lamps. Some companies predict that by 2005, LED luminous efficiency up to 50 lm / W, by 2015, the luminous efficiency of LED is expected to reach 150-200 lm / W. At that time, white LED operating current up to ampere level. This shows that the development of white LED writer lighting source, will be possible reality.
Incandescent and tungsten halogen lamps for general lighting, although inexpensive, have low luminous efficiency (the thermal effect of the lamp consumes no electricity), short service life, and heavy maintenance work. However, if the white LED is used for lighting, not only is the luminous efficiency high but also the service life Long (continuous working time of 10,000 hours or more), almost no maintenance. Hella, Germany, used white LEDs to develop aircraft reading lights; a street in Canberra, the capital of Australia, has used white LEDs for street lighting; and urban traffic management lights in our country are also replacing white traffic lights with early-stage traffic lights. Can be expected in the near future, white LED will enter the home to replace the existing lighting.
LED light source has the advantages of using low-voltage power supply, low energy consumption, strong applicability, high stability, short response time, no pollution to the environment, multi-color lighting and the like. Although the price is more expensive than the existing lighting equipment, Inevitably replace existing lighting devices.