These multi purpose lights are great on the Hubsan H501 for both daytime flying and evening flights. Easy to fit in seconds and with it's internal battery just charge from the supplied micro USB cable.. each unit weighs just 15g.
http://www.banggood.com/Hubsan-H501S-RC-Quadcopter-Spare-Parts-Warning-LED-Light-USB-Charging-p-1050877.html?p=AF31026165123201608Z
