Was browsing on hkequipment and saw some extremely attractive Xeno lights, the F and G series. Appearance wise, seem to be a notch above Solarforce, heck maybe even better than the large brands. But they're advertised with integral head and body. I'm thinking the heads are still threaded on, but sealed with adhesive. Not sure if the insides are potted. Boy, if Xeno made the smaller ones P60 compatible, and sold drop ins for the larger ones, I think they would get a lot of business and mention here.