... Approved, LC-10 is an American type receptacle, used for the twist-lock photocontrol, like LC-10/10J/10D series ... LC-10R is the receptacle of American type photocontrol, used for twist-lock photocontrol. To the aspect of fixing, it ... LC-10R, and the other is the prearranged type for inner lighting fixtures (Like Model LC-10R/1,LC ... 's request UL Approved Receptacle LC-10R (Used for Photo control)