How do I choose a heatsink for a COB LED?

How do I choose a heatsink for a COB LED?

1. STEP 1: Calculate the dissipated power: *P.
2. STEP 2: Calculate the ambient temperature: *T.
3. STEP 3: Determine the ideal case temperature: *T.
4. STEP 4: Choose a good thermal interface material with good thermal resistance: *Rth.
5. STEP 5: Calculate the required thermal resistance of heat sink: *R.

How do LED heat sinks work?

Heat sinks used with LEDs are designed to absorb and disperse excess heat away from the LED diode and into the heat sink. Passive or active air then circulates around the heat sink to help cool it.

Do SMD LEDs need heatsink?

LED light strips need heat sinks, or channels, to absorb the heat away from them and dissipate it back into the surrounding air. Without this, LED strips can quickly lose optimum performance. The best heat sinks are made from aluminium alloys, and need to match the size of the LED strip.

How hot do COB lights get?

2 LED junction’s temperature can easily exceed 250 degrees Celsius in a matter of seconds.

How are cob LEDs mounted to a heat sink?

Heat is then conducted up through the heat sink, and finally is convected to the air around the heat sink by natural convection or forced convection. Some heat is also radiated to the ambient. Below are 2 illustrations of COB LEDs mounted to a heat sink with a layer of thermal interface material (TIM) in between.

Which is the best heat sink for LEDs?

Copper is the best but because of its price point, aluminum is used more widely and is what the majority of the heat sinks we offer here at LEDSupply are. Thermoplastics, like our composite LED heat sink, can be used for smaller LEDs with lower heat dissipation requirements.

Are there any LEDs that do not produce heat?

A frequently listed advantage of LEDs is that they do not produce heat. In a way, this is true, LEDs are cool to the touch because they usually do not produce heat in the form of infrared (IR) radiation. This obviously doesn’t go for IR specific LEDs.

How much heat does an XLamp led produce?

Taken from Cree’s Application note on Thermal Management of XLamp LEDs: To be conservative, assume LEDs convert 25% of the input power to light and output 75% of the input power as heat. This estimate varies depending on current density, brightness and component, but is a good estimate for thermal design.