How is your LED mounted? The only option I can think of would be a T5 retro kit or something similar, especially since you'd probably want on of each side of the LED. Or were you thinking about adding a single 2 bulb fixture to the front or back of the LED? When I had a light fixture go bad, I bought a 2 lamp T5 fixture made my Hagen with the brand name GLO. I went looking for it and couldn't find the double fixture anywhere so my recommendation might be moot.