R2 moonlights are very good led lights. I have them on my tanks, however they don't work too well for photography. I have tried filters of green red and blue, and the blue works the best. Your plecs, and any other nocturnals will come out quite a bit more, and be very active. One thing to watch though is that you still give them normal lighting. Also these lights do not work if it is light out, or light coming from elsewhere in the room.