... Approved, LC-10 is an American type receptacle, used for the twist-lock photocontrol, like LC-10/10J/10D ... 10R is the receptacle of American type photocontrol, used for twist-lock photocontrol. To the aspect of fixing, ... divided into 2 types: one is integral type for fixing outside like LC-10R, and the other ... is the prearranged type for inner lighting fixtures (Like Model LC-10R/1, ...