I need electronics guru

[Paul B]

Ok I have some 5 volt 20 ma LEDs and I want to run them on a 12 volt power supply.
How many ohm resister do I need to make that happen?

My electronics school was way to long ago to figure this out.
It is not for the tank, it's for my boat.

 

[user 26995]

Hey Paul...you have my work #. Call the sales office and ask for an electronics person. They know boats! They will help you out.