I just ordered a 5M roll of 5050 SMD LEDs off stealbay and was going to use a 4ft strip for the back of my tank. I have a Ray 2 in the center which seems to be doing great for my emersed start but I will have red plants in the rear. I'm using the main bulk of the roll for another project, so before I buy a planted plus I thought I would give these a shot. Specs say 650-660nm for the reds. It's a 7 to 1 ratio red to blue.