I have a chip-on-board LED that requires 36V max, 300 mA, but I have a power supply designed for a
12V max, 900 mA LED. The power supply is a pretty standard constant current power supply that outputs 900 mA for the LED and adjusts the voltage as required.
Is there a simple way to take this output and convert it from 900 mA to 300 mA without disrupting the constant current power supply's regulation? I am aware things like buck converters exist but I am unsure if they will function properly in this instance.
The power supply is part of a larger unit and cannot be replaced. Solutions that only supply partial power to the LED (at least 5W) would be acceptable.
Update: I dug the old power supply out of the unit and discovered it is capable of 16V max at 16W max. It supplies 1A at 10.06V to a LED currently.