LED why heat?
As we all know , LED is a high-efficiency light source and is loved by designers because of its small size . But when they do not involve thermal management , they can be truly called “ small “ . Although the temperature of the LED light source is much lower than that of the incandescent light source of a temperature of up to 2500 degrees Celsius . Therefore , many designers finally realized that heat dissipation is a problem that can not be ignored . Although LED will still be hot , its temperature is relatively low , because there is no big problem . However , based on semiconductor device LED , its working temperature should be below 100 C . It According to the law of conservation of energy , heat must be transmitted to nearby areas . LED can only work at 25 C and 100 C , and the temperature range is only 75 C . Therefore , a larger heat dissipation surface and a very effective thermal management are needed . In theory , the total electro-optic conversion efficiency of LED is about 54% (theoretical value ) , only 1/4 of the theoretical value in reality ; the rest of the electricity will be released in the form of heat , which is why the LED heat dissipation ; poor heat dissipation , resulting in temperature rise ; (1 ) the rising of temperature is the decrease of luminous efficiency . (2 ) Temperature rise — — the main wavelength are affected : Blue light drift to short wavelength , other colors drift to long wavelength (red light ) temperature rises — — correlated color temperature (CCT ) : the correlated color temperature of white light increases , other color temperature will decrease ; Temperature rise — — positive voltage — — — positive voltage drop ; Temperature rise — — — reverse electricity Flow increases ; . Temperature rise — — — thermal stress increases . Temperature rise — the service life of components is shortened . _Temperature rise — — such as with phosphor , epoxy resin led , _temperature rise will lead to the deterioration of these materials ; . The above is only part of the high temperature on the performance of the LED part of the impact , the actual impact is far more than these , serious will lead to LED lamp failure ; 2 , LED heat sink and structure . Thermal failure is one of the failure modes of Out , so the use of good thermal conductivity to the LED heat transfer of the lamp shell ; the selection of appropriate thermal conductivity materials and good structure design directly determines the performance of the product.
