And vive versa. Not of any real importance, but its cool to marry lights like that and have them work. If you put the C-LE head on the P1 it won't turn on. Need about an 1/8 inch battery extender and then presto. Pretty cool to mess around with. The P1 with a C-LE head is a lot like a P1D-CE, but with the C-LE UI. Am I the first to discover this?