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Thanks all for the suggestions. Let me clarify a few things. I am turning to voltage to 3.8 volts, which just barely turns the diode on to ~35mA. Sometimes it is 32mA, sometimes 29mA. You are correct, I am not limiting the current, but I have a limit of 50mA set so that the supply...

Hello everyone - A lot of useful information here! I have some questions about the 405nm diodes. I bought some diodes from DTR and pressed them into heat sinks. These are then screwed to a water cooled plate. I have a current regulated power supply (not specifically made for diode driving)...