I mounted two super bright LEDs on the struts. They require a 1S lipo to operate. That's the batt you see lower right on the equipment tray. Behind the batt is the servo operated switch to the lights turn on and off. Once I see the locks are engaged I will turn them off to save the batt for lots of flights. I found I'd get about 30 minutes of lighting with them on steady so I'll have plenty of capacity even if I leave them on a lot.