I was always told that it was dangerous to shine LED lights in humans, could destroy something in the eye. It almost feels like you are holding a gun and need to point down to avoid shining the light in someone's eyes. I would definitely be careful though. Think about regular incandescent lights (that are probably no higher then 50-100 lumens) can be too bright for people as well and then magnify that with a powerful LED. I shine an incandescent light on my cat sometimes, she just blinks and looks away from it.