Didn’t use Orhpek lights myself, according to other bro. It’s very powerful, but as u said, not programmable. I will think it may be a overkill for a 3 feet.
Dosing pump can come later since ur not going triton. Maybe can prioritize ur initial equipment to save some moolah. Do shop around since ur not in a rush. Do look at AI Hydra HD lights too. Bang for buck.