Scenario - need to mount a 3W LED in 50 different locations on aluminium sculptures with a central power supply.
LED Vf = 3.0V, If = 1A. Cable run to each location (average length 15 meters) from central PSU with a resettable fuse or PTC for each run.
Proposed voltage supply wither 5v or 12v.
Will need to make PCB to hold SMD LED.
Originally thought I'd use a 5V supply requiring a 2R limiting resister (dissipating 2W). I figured I'd put the resistor with the LED on the PCB. Mounting point is internal on a 50mm aluminium tube - I can't use fasteners for the board to aluminium mount (can't pierce the art and it's concealed) and it's a curved surface. Thinking a thin / long board if needed and thermal epoxy to mount.
On further thought I figured there may be differing voltage drops over the cable runs and perhaps using a 1A constant current driver on the board might be a better idea. Can bump the PSU to 12v.
Thoughts, ideas, comments?
Potential mounting concept