led lighting control

I am trying to better understand how I can make this happen: 1. I will place LED "courtesy light" in a vehicle on inner door panels 2. When a door is open the LEDs will illuminate to full brightness 3. When door is closed the LED will turn OFF after 30 seconds (or other determined amount of time) OR 4. If key is in run position the LED will dim to a small percentage of full brightness to continually produce a lower amount of light while the vehicle is running. 5. When key is turned to the OFF position, the LED will dim up to illuminate at full brightness so passengers can exit the vehicle. Any ideas on how this can be accomplished?LaforzaLand

For full brightness, just a 30 second delayed off circuit/relay. For dimming, a PWM control as normal dimmers do not work well for LEDs.

Thanks. Just so I understand you correctly and being that I want this to happen automatically without manual intervention, I should... Connect the output of a standard 30-second delayed-OFF relay to the LED and also connect a PWM controller output to the same LED. When voltage from the 30-second delayed-OFF relay stops, pre-adjusted voltage from the PWM controller will be remaining? In other words, the 30-second delayed-OFF relay and the PWM controller BOTH provide voltage at the same time until the 30-second delayed-OFF relay no longer provides voltage, then it's only the PWM controller providing power? Sounds logical.LaforzaLand

See  https://www.the12volt.com/installbay/forum_posts.asp~TID~12294 .....

Oddly enough, these are usualy solved with PIC solutions, though novel relay and auto-dimming PWM combinations can work well.... 

Can you elaborate on what a "PIC" is?LaforzaLand

wikipedia PIC microcontroller It's akin to a uPC... eg - timers and dimming and PWM.... DigiMotive Dome Light Dimmer