Interior Light Delay Shut-off

You would not use a relay for the application you describe. One way of doing it is to make a voltage follower circuit using an op-amp. You would have an R-C network, as the input to the op-amp, charge up while the lamps are on through your existing circuit. Once you shut the door the power circuit would drop out and the voltage follower would supply voltage following the discharge rate of the RC network. The RC network would determine how quickly the lamps would dim to full off. You would have to have a constant power supply to the voltage follower circuit of sufficient capacity for the two lamps. Look up Voltage follower on Google. I once saw a schematic on a web site intended to do exactly what you describe but cannot recall where. If you look up automotive lamp dimmer you may find what you are looking for.

hotwaterwizard wrote: Or like these Regulators.

Thanks... I'm going to give this a try.  I appreciate everyones input.

Jim