For one of my groups of chicks I tried one of those battery-powered lights that you just tap to turn on (Wal Mart). We hung one on a screw just inside the coop door, and when it got near dark I reached in and tapped the light on. Worked like a charm - - when the young birds started getting nervous as dark set in, they noticed the dim light inside the coop and all marched up the ramp. When everyone was safely inside, I just reached in and tapped the light off.
I did this for about two weeks, and then I just quit tapping the light on since they were finally big grown-up chicks.
Hope that helps.
I did this for about two weeks, and then I just quit tapping the light on since they were finally big grown-up chicks.

Hope that helps.