Look in the Micro Mark catalog or any other such as Walthers, Bachmann, Tower etc for Model Railroad supplies. They have grain of wheat, GOW, bulbs in various wattages. You could use a 9V battery as in some flashlights for power. I've read of other flyers who just install the lights inside the wings and tail surfaces. If you have enough GOW bulbs you could light the whole aircraft However it would prbably be better to just light the wings and empennage for better directional orientation. Transparent covering is almost a necessity.