I am in the same boat as you looking for a light to hang over my new 525xl. I just saw the AquaticLife T5HO Hybrid that debuted at MACNA 2017 and is scheduled to start selling in December. It a BYO-LED setup that has mounting fixtures in the middle for the Radions or the Kessil LEDs and then T5HO on the sides with reflectors to keep light bleed at bay. Really think I want it but my tank is 59" wide and the light only goes up to 48"....don't know if 5 inches on either side of the tank would matter but seems like a 48" would be perfect for you.
"The T5HO fixture comes in 24, 36, and 48" lengths and they each hold up to four lamps. But the most intriguing part of the T5HO Hybrid fixture is that they come with several types of universal mountin brackets designed to allow the user to easily mount a radion, prime, hydro, kessil, and other LED fixtures between the T5 lamps."
Sounds pretty awesome to me.