if u want the light to constanly on (like at the base of the hallway of the theatre) when the switch is on, you should use a paralle layout. connect a 1.2k ohms, 1/4 watt resistor at the positive end of the LED, the resistor brings down the voltage enough so it wont burn the LEDs. Connect the other end of the resistor to the positive of your source and the negative of the LED to the negative of the source repeat this for as long as you want, supplied power must be 12vdc any higher and you'll fry the LEDs, I have done this with up to 50 LEDs. If you want them to flash, find an LED flash sequencer circuit and adapt it to the idea.