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Sorry Paul. I meant to catch up with you on that. Got hammered with real life stuff here. I understand your smaller need for the application you are after. I just wanted to share that they do make these of all different ratings that are smaller but adjustable as you like.

But I don’t see how any regulation of any kind can be used without the LED circuit being switched somehow “before” your custom voltage control to prevent continuous draw such as a momentary contact or on/off switch? Or a small relay to close that LED circuit when wanted such as only when an ignition switch accessory output is on?

It is the age old dilemma of the dash clock eventually running down the battery months later because it is not switched.

Sounds like you are making some sort of meter with the LEDs so they light at different voltages? Something I found with LEDS is no matter how they are rated they are pretty forgiving with voltage inputs. You can have 10 in a series rated for a load of 15 volts and short around two of these in the series circuit and they will still light normally without being overloaded because there are only 8 in the circuit.

Same in reverse, you can put only 10 volts instead of 15 volts to a circuit of 10 and they will still light up same as if they were getting the full 15. The rating range where they will work is kind of broad and forging. So I don’t know how much trying to regulate the input to them from 18 or even 20 volts down to 15 volts will make much of a difference to them. A series circuit of LEDs rated for 15 volts will probably also handle 18 without any problem.

I’m going to go back and read your OP to make sure I am not sending myself down the wrong track with what you are after. :)