It probably depends on model, but mine is dead silent (Mammotion Luba 2). However the reason I avoid running it at night is it has a fairly bright headlight, a

It probably depends on model, but mine is dead silent (Mammotion Luba 2). However the reason I avoid running it at night is it has a fairly bright headlight, and I worry it might create shadows/light effects in my neighbors house and I know they have little kids.