ARG
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On the way up to max power though if we record the mW/mA on a graph we should see where efficiency drops off. As it will be the same chemistry inside the diode, we can probably infer a general idea of what current to not exceed. I believe we will always see some degradation simply due to them all being chemically similar.
IIRC most 405nm diodes will keep on increasing in efficiency and power until they suddenly pop and die. They don't really have a drop off.