Reply To: Lighting Source for MOCs Home › Forums › All Things LEGO! › Lighting Source for MOCs › Reply To: Lighting Source for MOCs October 3, 2013 at 3:18 pm #3530 Greg SchubertParticipant Tim wrote: they appeared to be small enough to fit inside Lego bricks and they run off a battery box (3 C batteries) Are these 3V lights? Do you think we could power the lights from a 9V train transformer?