MLN-12 - ~4500k, 3 LED, very bright (1st), good for directional lighting, used with right angle outlet (Leviton 692-W) on hallway. MLN-16- ~3500K, 1 LED, not so bright. good for sink or near water with cover on to prevents water splash. I don't care too much about if photocell was on or off, since it only cost a dollar to operates a year.