Any light will do, on a timer switch. Don't know about battery, as ours runs on a cable from the goathouse. We extend both ends of the day, otherwise it will have to go on pretty early in December to make 12 hours daylight... and remember the earlier it comes on, the cockerel will be thinking it is morning and announcing it to all and sundry.... so evening might actually be better. Especially if you are using a solar powered one.