How To Choose LED Lamp Cap For Street Lights?

Street light is an important part of city lighting.High pressure sodium lamp is often used in conventional street lamps. The defect of low light efficiency of high pressure sodium lamp results in a huge waste of energy.Therefore, the development of new high efficiency, energy saving, long life, high color index, environmental protection street lamp cap for the energy saving of urban lighting has a very important significance.LED street light is a semiconductor lighting lamp, taking light-emitting diode as the light source, its light source is a kind of solid cold light source.Compared with conventional,LED street light has the characteristics of environmental protection, no pollution, less power consumption, high light efficiency and long life,gradually replace the traditional street lamp and become the "main force" of road lighting.

At present, LED lighting technology is becoming increasingly mature, and the efficiency of high-power LED light source has reached more than 100LM/W, which makes it possible to transform the energy saving of urban road lighting.Led lamp cap is an important part consisted of led road lighting fixture.The led lamp cap, especially high-power LED lamp cap, is hitting the lamp cap market of conventional street light at a rapid speed.

The lamp cap of LED street lights adopts aluminum alloy die-casting molding, so it has good performance of heat dissipation,waterproof and dustproof.The surface of the lamps has been treated with uv resistance and corrosion resistance, and the overall lamps meet the IP65 standard.The lamp housing can be made of PC pipe and can withstand 135 degrees of high temperature.The standard for LED street lamp cap is that the average illumination of the uniformity of road illuminance is at 0.48.The spot ratio is at 1:2, which is in line with road illumination.At present, the lens material of road lamp cap in the market is improved optical material, which has these characteristics of ≥93% of transmittance, -38 to +90 degrees of temperature resistance, UV resistance etc.

Heat dissipation design of led road lighting lamp cap

The design of traditional road lighting lamp cap focuses on the lumens of LED, but pays little attention to the heat dissipation of outdoor led lighting system.In fact, the number of lumens in led is increasing rapidly.In 2019, the number of lumens per watt of mass-produced led has reached 100 lumens, and this number is growing rapidly.The corresponding theoretical system of heat transfer has been mature, and the heat transfer methods we can use are basically clear: conduction, convection, radiation and phase change heat transfer.Therefore, in the heat transfer or heat dissipation problem, we can take measures are visible, limited.

The heat dissipation modes of LED street lamp cap mainly include: natural convection heat dissipation, forced heat dissipation with fan, heat pipe and loop heat pipe heat dissipation, etc.The method of forced heat dissipation with fan is complicated and has low reliability, and the heat dissipation mode of the heat pipe and the loop heat pipe has high cost.It is recommended to choose natural convection heat dissipation for LED street lamp cap as far as possible.

Advantages that LED lamp cap applied in street lights

1. The characteristics of LED lamp cap itself - unidirectional light, no light diffuse,lighting efficiency guarantee.

2. The LED lamp cap applied road lighting has a unique secondary optical design, which irradiates the light from the LED street lamp cap to the required lighting area, further improving the lighting efficiency,so as to achieve the purpose of energy saving.

3. LED light source efficiency has reached 90-110 lm/W, and there is still a lot of room for development, theoretical value can reach up to 250lm/W.While the luminous efficiency of high-pressure sodium lamp increases with the increase of power, so the overall luminous efficiency of LED street lamp is higher than that of conventional high-pressure sodium lamp.

4. The light colour rendering properties of LED street lamp cap is much higher than that of high-pressure sodium lamp.The color rendering index of high-pressure sodium lamp is only about 23, while the index of LED street lamp cap is above 75.

5. The light decay of LED street lights is small, less than 3% in one year, and it still meets the illumination requirements for road lighting after 10 years of use.While the traditional high pressure sodium lamp has higher light decay compared with led lamp,it will decline above 30% after one year of use.

6. Led is low-voltage devices.Compared with power source that uses high-voltage,led is safer,which is particularly suitable for public lighting such as road lighting,park lighting,square lighting etc.

7. Road lighting lamps that take LED as light source has longer lifespan,can use for above 50,000 hours.The disadvantage is that the life of power supply can not be guaranteed.

Disadvantages of road lighting lamps that use LED lamp cap

1. Single LED has low power. In order to obtain high power, multiple parallel connections are required.

2. Existence of light spot problem. The "yellow circle" problem is easy to be caused by the defect of white LED manufacturing process and the matching error between white LED and reflection cup or lens.

3. Heat dissipation problem. Street lamp cap use high-power LED light source. High-power LED has the problem of heat dissipation which is difficult to solve.The brightness will be significantly reduced after overheating, and the light decay is serious, so the power can not be too large.

How to choose LED street lamp cap to reduce the probability of failure?

When maintaining street lamps, some LED street lamps do not work, that maybe because the internal failure or damage of the LED street lamp cap.So how to choose the high-quality led lamp cap for street light to avoid the failure and damage?

1. Choosing LED chip with high quality.The quality of LED chips on the market is uneven.Some LED chips are low in price, but the quality is in poor in proportion and the service life is very short. When choosing, we should choose high-quality brand LED chips.

2. Choosing led lamp cap with good performance of heat dissipation.If the heat dissipation performance of led lamp cap is bad, the internal heat of the Led street light will be too high, which is easy to cause the damage of Led chip and the phenomenon of not bright.

3. LED street lamps need to turn high voltage into low voltage through the driving power supply to work, and this link greatly tests the performance of the power supply , so choosing power supply products with high-quality can effectively ensure the service life.

If you want to buy led street lights with long service life, choosing led lamp cap applied in street light with good quality is one of important factors.You should also pay attention to regular maintenance at ordinary times, so as to ensure the stability of LED street lamps.