Oh I do indeed have one and swear by it. I didn't look around the roost first thing this morning as the idea she dropped an egg from there only just came to me.You need one of those forehead LED lamps like o have. I can leave lights off and just use the lamp to check nest boxes and roosting chickies without disturbing them.
I don't find the lamp light to be good for telling comb color. It is nice and light now so I will go back out and inspect.