Hi,
With "CARELESS" he will always turn the lights on. With "Aware" or "steath" he will always turn off and will react to any kind of enemy threat which makes him having sometimes an eccentric trajectory.
Try to let him "aware" and send this:
_helo setBehaviour "AWARE"
_helo setSkill 0
_helo disableAI "TARGET"
_helo disableAI "AUTOTARGET"
It's going to increase his level of stupidity