I'm designing a color mixed light source and trying to achieve a dense array of Rebel LEDs, which leads to the expected thermal management issues. In the application notes you list the power input to the thermal resistance equations as (forward voltage * forward current). Is all of that power converted to heat?
Looking at the Royal Blue parts, I*V is 0.7A * 3.4V = 2.38W, but the data sheet lists the light output as 0.74W. Is it then safe to assume that the heat output is 2.38 - 0.74 = 1.64W?
If so, how is the light energy output calculated for the parts specified in lumens?