I got a customerized LED from BML, 48 inches as yours. I have 6500K cool white with 4 replacement of 660 nm deep red, it showes the red very nicely, with no problem with green either. Unfortunately, it doens't come with tank mount and you have to buy it seperately, and it will lift the light about 1 inch from the surface of the tank, and allow you to tilt the light front or back slightly. I alos bought the dimmer, I think it is needed since 100% is too strong. I keep it at 75 to 80% and the plants are happy. I have a 75g and it is deeper than yours, so I have 90 degree angle, you may try 75.
Hope this helps.