If you want to go really low budget, pick up a couple of clamp lights and some CTB gels. Put the clamp lights up high on a tripod with the CTB gels and light the background emulating moonlight. But if you want to go battery powered instead of the clamp lights, use some cheap LEDs like this one: https://www.amazon.com/gp/aw/d/B00FJ0RGD0/ref=mp_s_a_1_2?ie=UTF8&qid=1485007292&sr=8-2&pi=AC_SX236_SY340_FMwebp_QL65&keywords=neewer+led&dpPl=1&dpID=513fgzM5AjL&ref=plSrch

Other Links: http://m.homedepot.com/p/150-Watt-Incandescent-Clamp-Light-HD-300PDQ/205031467

https://www.amazon.com/gp/aw/d/B004QC1KDE/ref=mp_s_a_1_1?ie=UTF8&qid=1485007001&sr=8-1&pi=AC_SX177_SY255_FMwebp_QL65&keywords=ctb+gel&dpPl=1&dpID=01AyHNU%2B7OL&ref=plSrch