I'm trying to find a good and cheap way to turn on some led strips with car battery without burning or stressing the leds. I've found out it can be done with a resistor but it's not the best way to do it, since it will get dimmer/brighter depending on the voltage of battery at the time. Also found out it can be done with constant-current led drivers (made with lm317), but the problem is that these regulators have a voltage drop (3v for lm317 I think). So the output voltage will be less than 12v. Will the leds turn on with less than 12v? (It will be around 9v if i'm not wrong.) If not what should I do?
Also this is the driver i'm talking about:
I think I'm getting lost ._.