Comprehensive analysis of LED lighting performance advantages and its uses
Beginning in the 21st century, LEDs developed through the wonderful encounter between nature, humans and science will become the innovation of the light world and the green technology light revolution essential to mankind. LED will be the great light revolution since Edison invented the light bulb. With the increasing awareness of power saving, the market demand for LED lighting products with energy-saving performance is rapidly expanding. In the unique performance of the LED light source, the light conversion function mainly based on dimming and color grading will attract much attention.
Basic performance of LED lighting
The LED market has been very hot recently. At present, LED lighting is used in urban night lighting and building lighting. With the rush of the market, as consumers, LEDs still need to be calm, scientific analysis, select the best cost-effective light source and lamps, the following describes the basic performance of several LEDs:
1. The brightness of the brightness LED is different and the price is different. The LOFweek semiconductor lighting network ED for LED luminaires shall comply with the laser class I standard.
2, anti-static ability Anti-static ability of the LED, long life, and therefore high price. LEDs with an antistatic greater than 700V are usually used for LED lighting.
3. LEDs with the same wavelength and wavelength have the same color. If the color is consistent, the price is high. It is difficult for manufacturers without LED spectrophotometers to produce pure color products.
4. Leakage current LED is a unidirectional conductive illuminator. If there is reverse current, it is called leakage, and LED with large leakage current has short life and low price.
5. LEDs with different illumination angles have different illumination angles. Special lighting angle, the price is higher. Such as the full diffusing angle, the price is higher.
6. The key to different quality of life is life, and life is determined by light decay. Low light decay, long life, long life and high price.
7. The illuminator of the wafer LED is a wafer, and the price of the wafer varies greatly. The chips in Japan and the United States are relatively expensive, and the prices of wafers in Taiwan and China are generally lower than those in Japan and the United States.
8. Wafer Size The size of the wafer is indicated by the side length. The quality of the large wafer LED is better than that of the small wafer. The price is proportional to the size of the wafer.
9, colloidal ordinary LED colloid is generally epoxy resin, LED with anti-ultraviolet and fire retardant is more expensive, high-quality outdoor LED lighting should be resistant to UV and fire.
Each product will have different designs. Different designs are suitable for different purposes. The reliability design of LED lighting includes: electrical safety, fire safety, environmental safety, mechanical safety, health and safety, and safe use time. From the perspective of electrical safety, it should comply with relevant international and national standards.
Since LED is a new product, China's national standard lags behind, but the country provides product qualification testing. LED lighting with international safety certification and national product quality certificate is expensive because these products are reliable in safety design. Consumers are paying attention to the authenticity of the certificate. There are not many manufacturers with international safety certification and national product certification.
From the aspect of health, the price of products designed with non-toxic materials is high, especially for indoor LED lighting. Don't use cheap LED lighting with odor. At present, only a few LED manufacturers use non-toxic materials to produce, discerning methods. You can use your nose directly, and the smelly products are much cheaper than the odorless ones. Similar to lead, mercury, cadmium, etc.
Toxins require expert analysis. From the perspective of applicable environmental safety, there is a reliable dust-proof and moisture-proof design, and the price of LED products with fireproofing, ultraviolet protection and low-temperature cracking is high.
LED main features
Ordinary fluorescent lamp
There is a filament at each end of the fluorescent lamp. The tube is filled with a small amount of argon and thin mercury vapor. The inner wall of the tube is coated with phosphor powder. When the gas between the two filaments conducts electricity, it emits ultraviolet light, which makes the phosphor powder soft. Visible light.
Fluorescent lamp working characteristics: A high voltage is required when the lamp starts to ignite, and only a small current is allowed to pass during normal illumination. At this time, the voltage across the lamp is lower than the power supply voltage.
The fluorescent tube is equipped with a filament at both ends, and the inner wall of the glass tube is coated with a uniform thin fluorescent powder. After the tube is evacuated to a vacuum of 10-3-10-4 mmHg, a small amount of inert gas is charged, and a small amount of liquid mercury is also injected. . An inductive ballast is a core inductive coil. The nature of the inductor is that when the current in the coil changes, the flux will cause a change in the flux, resulting in an induced electromotive force whose direction is opposite to the direction of the current, thus hindering The current changes.
The starter acts as a switch in the circuit. It is formed by a helium discharge tube connected in parallel with a capacitor. The function of the capacitor is to eliminate the electromagnetic interference to the power supply and form an oscillating circuit with the ballast to increase the starting pulse voltage amplitude. One electrode of the discharge tube is composed of a bimetal piece, and is heated by the bubble discharge, so that when the bimetal piece is opened and closed, the current of the inductance ballast is abrupt and a high voltage pulse is generated to be applied to both ends of the lamp tube.
When the fluorescent lamp is connected to the circuit, the glow discharge is started between the two electrodes of the starter, so that the bimetal is thermally expanded and contacts the static contact, so that the power source, the ballast, the filament and the starter form a closed loop, and the current The filament is preheated, and after 1-3 seconds of heating, the glow discharge between the two electrodes of the starter is extinguished, and the bimetal is cooled and disconnected from the static electrode, when the two electrodes are disconnected The current in the circuit suddenly disappears, so the ballast generates a high-voltage pulse. After it is superimposed with the power supply, the OFweek semiconductor illumination network is added to both ends of the lamp tube, so that the inert gas in the lamp tube is ionized to cause arc discharge, which is normally illuminated. In the process, the self-inductance of the ballast also acts to stabilize the current in the circuit.
LED fluorescent lamp
Led fluorescent lamps are characterized by high quality, durability and energy saving. The range of projection angle adjustment is large, and the brightness of 15W is equivalent to ordinary 40W fluorescent lamps. High temperature resistance, moisture proof and waterproof, and leakage prevention.
The voltage is 110V, 220V, and the cover is made of glass or PC. The lamp head is the same as a regular fluorescent lamp.
LED fluorescent lamp adopts the latest LED light source technology, digital design, saving more than 70%, 12W LED daylighting is equivalent to 40W fluorescent tube (for ballast and starter, 36W fluorescent lamp real consumption The power is 42W to 44W). LED fluorescent lamp life is more than 10 times that of ordinary lamp, almost maintenance-free, no need to change lamp, ballast, starter frequently. The green and environmentally friendly semiconductor electric light source has soft light and pure spectrum, which is beneficial to the user's vision protection and health. The 6000K cold light source gives a visually cool feeling, and the humanized illuminance difference design helps to concentrate and improve efficiency.
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