Aerial Concepts have got an aircraft lighting kit that's the bomb! The kit comes with a small IC board with ports for connecting the LEDs. Each LED has about a 500mm long lead, and the kit comes with 1x Green LED, 1x Red LED for wing tips, 2x White LEDS for fash flashing strobes, 2x Red LEDs for slow flashing beacon lights and 2x High Bright White LEDs for landing lights. The set-up weighs next to nothing and is powered off the BEC circuits via spare channel on Rx.
I bought myself a kit and have put it on the B-777, it looks absolutely amazing, and I can't wait to fly again to see what it looks like in the air. The complete kit is R150.