Designing some high power LED devices with SMD RGB LEDs.
These parts are very small (5 x 5 mm) yest dissipate large amounts of power.
For current 0.6 A and the forward LED voltage, the part will draw about 5 electrical watts with R,G,B all on.
From the thermal perspective, I usually assume that all the power goes to heat, a conservative approach.
But... as these devices become more efficient, this assumption becomes inaccurate:
The question is:
How do I calculate how much actual power (watts) that actually radiates in the form of light?
Total power input (VA)= radiated optical power + heat energy produced.
The heat output will always be less than the total input power, but by how much?
These parts are very small (5 x 5 mm) yest dissipate large amounts of power.
For current 0.6 A and the forward LED voltage, the part will draw about 5 electrical watts with R,G,B all on.
From the thermal perspective, I usually assume that all the power goes to heat, a conservative approach.
But... as these devices become more efficient, this assumption becomes inaccurate:
The question is:
How do I calculate how much actual power (watts) that actually radiates in the form of light?
Total power input (VA)= radiated optical power + heat energy produced.
The heat output will always be less than the total input power, but by how much?
