Some of the black box LEDs have timer controls. Mine don't, but I bought a wifi power strip that lets me turn on/off on set times. Less than 30 bucks on Amazon.
Most of the black boxes at least have intensity controls for blue and white, even if you can't individually select colors. For a 48" tank you'd probably just need 2.
I went ahead and got them, as I figured I'd want to add a few corals down the road.