In an app a white Luxeon emitter (1W ) is run at very low currents (20 to 40mA) for extended periods of time.
Originally it was not recommended to run these below ~200mA else current crowding, channeling and whatever could lead to dramatic output variations over time.
Has this been improved? What output variation may be expected at these current levels?
(Modulating the led is not an option at this time)