Source： RUI JIN
Light-Emitting Diodes (LEDs) are semiconductor electronic components that convert electrical energy into light energy. This
Electronic components emerged as early as 1962. They could only emit low-light red light in the early stages, and later developed other monochromatic light versions that can be issued today.
The light has spread to visible light, infrared light, and ultraviolet light, and the photometric brightness has also been increased to a considerable brightness. The use is also used as indicators, display boards, etc. from the beginning;
With the continuous advancement of technology, light-emitting diodes have been widely used in displays, television lighting decoration and lighting.
With the continued development of the industry, technological leap breakthroughs, application of vigorous promotion, LED light efficiency is also constantly improving, the price continues to decline. new
The emergence of modular dies also increases the power of individual LED tubes (modules). Through the continuous efforts of the industry to research and development, the new optical design process
Breakthroughs, the development of new light types, and the single product situation are also expected to be further reversed. Improvements in control software also make LED lighting more convenient to use
. These gradual changes all reflect the bright prospects of LED light-emitting diodes in lighting applications.
LED is called the fourth generation light source, with energy saving, environmental protection, safety, long life, low power consumption, low heat, high brightness, waterproof, miniature, shockproof, easy
Dimming, beam concentration, easy maintenance and other features, can be widely used in a variety of instructions, display, decoration, backlight, general lighting and other fields.
Advantages of LED: high efficiency of electro-optical conversion (close to 60%, green, long life (up to 100,000 hours), low operating voltage (about 3V), repeated
Non-destructive life switch, small size, less heat, high brightness, durable, easy dimming, multi-color, beam focused and stable, start without delay;
Disadvantages of LEDs: high initial cost, poor color rendering, low efficiency of high-power LEDs, constant-current driving (required for dedicated driver circuits). In contrast, various transmissions
System lighting has certain flaws.
Incandescent lamps: low electro-optical conversion efficiency (about 10%), short life (about 1000 hours), high heating temperature, single color, and low color temperature;
Fluorescent lamps: Electro-optic conversion efficiency is not high (about 30%), harm to the environment (including mercury and other harmful elements, about 3.5-5mg/ only), non-adjustable brightness (low
Voltage can not start to glow (luminous), UV radiation, flicker phenomenon, slow start-up, rising prices of rare earth raw materials (The proportion of the cost of phosphors increases from 10% to
60~70%), repeated switching affects life; bulky.
High-pressure gas discharge lamps: large power consumption, unsafe use, short life, heat dissipation problems, and are mostly used for outdoor lighting.