I've read LEDs produce a strobe effect to chickens
I think you both got confused with fluorescent light? LED light has no strobe effect and is safe to use in a coop.Yes LED lights are terrible for humans and animals alike. The flicker rate is much to high and is very straining on the eyes.
Looked it up on the internet: Lghting with a frequency of up to 160 Hertz, the chicken can perceive flashes of light. Traditional fluorescent lighting has a frequency of 50 Hertz.