Product Code: GL-FL-800W
Qty of pole: 16
Beam Angle: 38°
Installation Date: Mar 2017
Location: Tennis court in Netherlands
LED stadium floodlight knowledge corner.
Why LED light need Heat dissipation?
With the development of semiconductor industry, as the 21st century the most promising new type of green light source, LED lighting gradually penetrated into our life.LED lighting technology has big difference with traditional lighting, LED lighting efficacy less than 30% at present, that is to say, about 70% of the electrical energy into heat energy.The luminous decay and lifespan of LED light directly related to its junction temperature, if heat dissipation is bad then junction temperature is high, lifespan is short, so the reliability of the LED lighting lamps depends on the heat dissipation.According to the ray new algorithms for every 10 ℃ below the temperature will extend 2 times longer lifespan.We can see the relationship between luminous decay and junction temperature which Released from the CREE company that if the junction temperature can be controlled at 65 ° C, then the light of 70% lifespan can be as high as 100000 hours!How to improve the level of heat dissipation become one of the key technology of LED lighting.
Picture 1:The relationship between luminous decay and junction temperature
Junction temperature not only affects the lifespan, but also directly affect the luminous efficiency for a short period of time.For example CREE XLamp7090XR-E chip’s luminous and Junction temperature realationship as below picture:
Picture2: The relationship between luminous and Junction temperature?
If the Junction temperature is 25degree and 100% luminous,when the junction temperature rise to 60 degree,then only 90% luminous,when rise to 100 degree,luminous falls to 80%,rise to 140degree only 70% luminous.So we can see improve heat dissipation, control the junction temperature ,how important it is!
In addition the heating of LED will move the spectrum ;rise the colour temperature;When forward current increases (constant voltage power supply);Reverse current also increases;The thermal stress increases;Phosphor epoxy resin aging accelerately …., so the LED heat dissipation is one of the most important in the design of LED lamps and lanterns.
More info and testing report fiels feel free meail to Mecree.