Why is the higher the current, the lower the light efficiency?
What I know is: junction thermal resistance, spectral distribution drift
Because the higher the current, according to Ohm's law, of course, the power will also increase, while the luminous efficiency is the total luminous flux / total power
The reason is simple, because the current increases, the power of the lamp increases greatly, but the relative luminous flux increases not in proportion. That is, power increases faster than light flux increases. So if you increase the current, the light will decrease. But the brightness will increase.
