NPN switched emergency light..an example if using NPN transistors in an inverter config so that when the switch is opened the LEDs turn on instead of the usual way. The switch is supposed to represent a power outage and the DC supply would be a wall wart adapter plugged into the light.I see a problem with the circuit where the outage unlike the switch would cut power to the 2nd npn base and turn off LEDs..see if u have a solution.
