LED Lighting Blog

LED street lamp selection of LED is very important, some manufacturers use single integrated package 10W, combined production of street lights, there are optical light distribution difficult, prone to glare, the overall cooling difficulties defects. Useful 3W ~ 5W module, LED meter-per-watt light efficiency is low, there are also the overall heat dissipation problem, the same luminous flux compared with the single 1W price advantage is not obvious. Taken together, the selection of high-power 1W LED is more reasonable. Technical level from the current high-power LED 1W light efficiency is relatively high, led high bay for the obvious advantages of energy-saving lighting, the current selection of 1W to do the street light is more reasonable.
LED light color selection is also a noteworthy factor. In the development of road lighting, there is a comparison of the use of yellow and white. Yellow is now the mainstream of high-pressure sodium lamp, because of its economic energy, while they have excellent through fog performance, has become the mainstream the street for our country.Nevertheless, the yellow light, but also has its deficiencies: that is the color reproduction is poor. People feel that way, sodium lights, the illuminated colors are yellow and distortion.
The pursuit of white light is natural sunlight. Because it has the best color performance, while the sun is a warm white light. So, If you can do and similar to daylight white light, while to take into account energy-saving advantages of yellow, it would be the ideal selection of lighting at night. The early stage of white light is a metal halide lamp, although it has the ability to perform than the yellow color over several times higher, but through the fog of poor performance, low useful life are difficult to overcome technical problems and has not been large-scale application. LED light source production can compensate for this shortcoming. Choice of LED light source’s color temperature 3500K or so more appropriate to meet the lighting requirements in photopic vision and comfort. Is feasible, but also in the development of today’s LED light effect on the cost and large area suitable for LED lights.
Above 6000K white street light held different views,ul led street light especially over high-power 160W, a cautious attitude in the fast road use. National standards for road lighting, highway, trunk road must be cut-off light type or half light lamps.
Cut-off light fixtures: maximum intensity direction and lighting of lamps down the vertical axis angle between 0 ° ~ 65 °, an angle of 90 ° and 80 ° angle of the direction of light intensity on the maximum allowable value for 10cd/1000lm and 30cd / 1000lm lamp.Regardless of the size of the light flux, the light intensity in a 90 ° angle to the direction of the maximum shall not exceed 1000cd.
Half of the light-type lamps: the maximum intensity direction and lighting of the lamp down the vertical axis angle between 0 ° to 75 °, an angle of 90 ° and 80 ° angle of the direction of light intensity on the maximum allowable value for 50cd/1000lm and 100cd / 1000lm lamp. Regardless of the size of the light flux, the light intensity in a 90 ° angle to the direction of the maximum shall not exceed 1000cd.ul led street light
Expressway road, road width, traffic is heavy, fast speed, visual acuity requirements.Brightness uniformity of illuminance, color temperature, on the road, glare indicator. In order to 400W high pressure sodium than blindly to the requirements of high power, high brightness. And LED today regardless of the luminous efficiency or have difficulty in cooling costs, cost-effective on the promotion difficult.