If "stabbed" into a solar plexus, it's a good extension of your reach. However, if used as a club, and too a head, there is the probability of a blunt-instrument cut.
So, in today's world of tort liability, I would wrap a couple of layers of cloth around the body of the light, taping into place. It would still provide an effective thump, but be less likely to cut.
"See? I was trying to avoid harming anybody!"
, Art