1. Beware of the low price trap. The price of LED light source varies greatly. This gap is mainly reflected in the reliability and LED light decay, appearance and technology and other performance above. The LED with low price has small chip size, rough electrode, poor materials (phosphor and glue), poor resistance to current, poor temperature and humidity, fast light decay, short life, so blindly pursuing low price may not be worth the cost.
2. Identify relevant standards. From the perspective of safety, products should meet relevant international and national standards. As LED is a new product, China's national standard lags behind, and only product qualification test is provided. Therefore, the international safety certification (such as GS, CE, UL, etc.) is the standard to measure the quality of LED lights, and there are not many manufacturers that have the international safety certification and national product quality certificate, so the authenticity of the certificate needs to be carefully identified when purchasing. Have the product of international safety attestation, the price is higher commonly.
3. The LED lamp with constant current power supply is selected. The price of LED driving power supply, such as resistor, capacitor and IC, varies greatly. Some drive power supply is only constant voltage, and do not do constant current, and LED lights must be constant current to better ensure the quality and service life. Therefore, this point requires extra attention when purchasing, especially for high-power LED lights.
Encapsulation is introduced
Simply put, led packaging is the process of packaging led materials into led lights
In general, led packaging must go through the processes of crystal expansion, solid crystal, welding wire, glue filling, drying, foot cutting and color separation
Led main packaging materials are: chip, gold wire, support, glue, etc
Crystal expanding equipment, solid crystal machine, welding line machine, dispenser, baking oven, etc., generally divided into two kinds of automatic packaging equipment manual packaging equipment.
Packaging is good or bad
Led lights good or bad indicators: luminous Angle, brightness, color (wavelength) consistency, anti-static ability, anti-attenuation ability, waterproof ability, color index
Led packaging material: led packaging material is the direct factor of the quality of led lights, but also the most basic factor, led light is a combination of several main materials, a good led light must be all packaging materials and production technology combination
Led lamp packaging technology: general automatic equipment packaging is better than manual packaging, packaging technology is also the main factor of led lamp packaging quality, the same material different manufacturers produce products have great differences
The choose and buy of the lamp
The main use of outdoor led electronic screen is direct plug type oval led light, and the main use of indoor led electronic screen is table stick led light.
Brightness depends on factors such as voltage, current, lens and LED lamp working environment
The red light wavelengths
620 nm to 625 nm,
Green light wavelength
520 nm to 525 nm,
Blue light wavelength
465 nm to 470 nm.
The LED lamp:
Product features and advantages:
1. With automatic packaging equipment and imported packaging technology, the service life can be more than 50,000 hours (10 years);
2, the use of the most advanced secondary light distribution technology, the best optical distribution, light output rate of the lamps can reach more than 90%;
3. Pressure-stabilized actuator, power factor above 0.95, power efficiency above 92%;
4. The lamp shell is made of aluminum alloy with high thermal conductivity. The structure design is reasonable and the projection Angle can be adjusted at will.
5, LED light source is optional colors: red, yellow, blue, green and white, single seven color, color, optional light Angle between 15 ° and 120 °;
6, low power consumption, long life, installation, chic and elegant modeling, dust, leakage, corrosion prevention;
7, beautiful appearance generous, green, energy-saving, environmental protection, can be in to 40 ℃ to 50 ℃ ambient temperature normal use;
Safety requirements for LED lamps
LED has the advantages of energy saving and environmental protection, and has become the main trend in the development of lighting industry. Because the technology and product properties of LED are quite different from that of traditional lamps, the current safety standard specification of general lamps is obviously not applicable. To help address this issue, this issue covers the technology used in LED lighting, the range of potential applications, and the safety assessment used by UL.
LED lamp technology and characteristics
The so-called LED luminaires, as the name implies, are the Light emitting Diode (LED) technology that is the emitting Light product
The light source. LED is a solid-state semiconductor components, and its consequent use current flow to the semiconductor p-n junction coupling, again by semiconductor in the separation of negatively charged electrons and positively charged holes after combination, two kinds of carriers and photon emission, different kinds of LED can emit from infrared to blue, and purple light to uv between different wavelengths of light, etc. In recent years, the new development is the blue LED coated with fluorescent powder, blue LED into white LED products. This operation usually needs to be matched with LED Driver or Power Supply. The main function of the drive circuit or Power Supply is to convert the ac voltage into the dc Power Supply, and complete the voltage and current corresponding to the LED at the same time to drive the matched components.
LED light bulbs are small in size, light in weight, and encapsulated in epoxy resin, which can withstand high mechanical impact and vibration, not easy to break, and the brightness attenuation cycle is long, so its service life can be up to 50,000-100,000 hours, far more than the traditional tungsten filament bulb 1,000 hours and 10,000 hours of fluorescent tube. Since the service life of LED lamps can be up to 5 ~10 years, not only the replacement cost of lamps can be greatly reduced, but also because of its characteristics of driving light with very little current. Under the same lighting effect, the power consumption is only half of that of fluorescent lamps. Therefore, LED also has the advantages of power saving and energy saving. However, because some LED technologies are not enough, the disadvantages of using LED lamps in the beginning include poor light quality (color performance, consistency, color temperature), difficulty in heat dissipation, and high price. Improper heat dissipation will lead to accelerated attenuation of LED lamps' brightness and service life of circuit components. Manufacturing technology has advanced rapidly, but these shortcomings include the gradual reduction of thermal resistance of LED and the improvement of light quality. In 2008, the luminous efficiency of LED white cold light has reached 100 Lm/W, while that of LED warm white light is expected to increase from 70 Lm/W to 100 Lm/W in 2010. Compared with other general light sources, about 15 Lm/W tungsten filament bulbs, fluorescent fluorescent lamps about 45~60 Lm/W, HID lamps about 120~150 Lm/W, LED luminous efficiency has obviously become more advantageous; The following is the lamp performance comparison for LED and other common lamps:
White LED heat source less, wide operating environment, miniaturization, vibration resistance, beam concentration
Fluorescent light fluorescent light saves electricity, but waste is fragile and has problems such as mercury pollution
Incandescent tungsten lamp is low efficiency, high power consumption, short life, fragile
1. Exterior lighting of buildings
The projection of a certain area of a building is nothing more than the use of light projection lamps in the shape of a round head and a square head that control the beam Angle, which is completely consistent with the concept of traditional light projection lamps. However, due to the small and thin LED light source, the development of linear projection lamps has undoubtedly become a highlight of LED projection lamps, because many buildings do not have a prominent place to put traditional projection lights. It is easy to install, both horizontally and vertically, and can be better integrated with the building surface, bringing new lighting vocabulary for lighting designers and expanding the creative space. And will have the influence to the modern building and the historical building illumination technique.
2. Landscape lighting
Because LED light source is not like the traditional lamps and lanterns is mostly glass bubble shell, it can be very good organic combination with urban street furniture. Lighting can be used in urban leisure Spaces such as paths, stairs, decks, waterfront areas, and gardens. For flowers or low shrubs, use leds as a light source. LED hidden projection lamps will be particularly favored. The fixed end can be designed as a plug type, which can be adjusted according to the height of plant growth.
3. Identification and indicative lighting
Need for space limit and guide sites, such as road pavement separate display, stair step of local lighting, lighting orders of the emergency exit, you can use the surface brightness of appropriate buried lamp or LED illumination is embedded in the vertical wall lamps and lanterns, such as cinema audience hall, the ground guiding light or seat side lights, as well as shopping centers within the guiding light of floor, etc. In addition, compared with neon lights, LED is of low voltage and no fragile glass, which will not increase the cost due to bending in production. Therefore, it is worth promoting the use of LED in logo design.
As far as lighting quality is concerned, LED light source has no heat, ultraviolet and infrared radiation, which will not cause damage to exhibits or commodities. Compared with traditional light source, lamps and lanterns do not need additional light filter device, and the lighting system is simple, low cost and easy to install. Its fine
Indeed, the lighting can be used as an alternative to the museum's fiber-optic lighting. Commercial lighting metropolis USES colored LED, indoor decorative white LED combined with interior decoration to provide auxiliary lighting, hidden light belt can use LED, especially for low space.
5. Lighting of entertainment places and stages
Because of the LED's dynamic, digital control of color, brightness, and dimming, vibrant saturated colors create both static and dynamic lighting effects. From white light to any color in the full spectrum, the use of leds opens up new ideas for lighting such Spaces. A long-life, high-lumen maintenance value (maintaining 90% light flow after 10,000 hours) reduces maintenance costs and the frequency of light source replacement compared to the 50-250 hour life of PAR and metal halide lamps. In addition, the LED overcomes the phenomenon of color deviation after using the metal halide lamp for a period of time. Compared with PAR lamps, no thermal radiation can make the space more comfortable. LED color decoration wall in the restaurant building has become a trend.
6. Video screen
Full-color LED display screen is the most eye-catching outdoor large display device in the world today, using advanced digital video processing technology, with unparalleled large area and ultra-high brightness. In addition, led lights installed on the screen can also be used according to different indoor and outdoor environments, with a variety of specifications of luminous pixels, to achieve different brightness, color, resolution, to meet various purposes. It can dynamically display graphic animation information, using multimedia technology, can play all kinds of multimedia files. The most influential LED display in the world is the New York stock exchange in times square, Manhattan, which USES a total of 18,677,760 leds with an area of 10,736 square feet. The screen can be divided into multiple images, and at the same time, the Wall Street stock market at a glance before the public. In addition, aurora international headquarters rising in the lujiazui financial center in pudong, Shanghai, the whole building facing puxi is covered with 100 meters of ultra-large LED screens, with a total area of 3,600 square meters. Number one in the world.
7. Vehicle indicator lighting
Used for vehicle road traffic LED navigation information display. In the field of urban traffic and expressway, LED, as variable indicator and lighting function, has been widely used as a substitute for similar foreign products. Among them, power dispatching, vehicle dynamic tracking, vehicle dispatching management, etc., are also gradually adopting high-density LED display to play the role of indicator lighting.