I know that the mini Coralife fixture uses a plug right on the end of each wire attached to the lamps pins, and the lamp is held in place by clips on the glass tube itself... they don't even have the end cap you show there at all... I have always wanted to do that, I have even thought about soldering the wire right to the lamp pin. I don't know how you could insulate it though. Maybe some heat shrink on there? It almost looks like some type of posi-lock automotive connector.