Only time I think it would be remotely useful would be spraying something white. But I agree with DATEC that I would never want something attached to the gun. Give me more lighting in the booth (or wherever I'm spraying). Also maybe just me, and maybe I'm being a "snob" but I noticed that in the video they weren't spraying in a booth and nothing had been sprayed there before because the floor had no overspray on it. Little things like that throw me off when I see videos promoting something. Give me a guy with overspray on his paint suit, a dirty looking (overspray) booth, I'd be inclined to believe the value of a product more.