My MXDL 3watt (damaged) consumes powere when off. I went into my store room and turned off all the lights and I knowtise a very very faint glow. Removed the battery pack and the glow vanished...
any light that uses a switch mechansim that does not unlatch the battery from the circuit completely, sure its off but some batteries are still plugged into the circuit, but SF lights and other lights with a tail cap clicky that is simply that a clicky, no programming should not drain power, so that helps if your looking out for specific lights.