To HybridHerp, the old Odyssea fixtures are the ones that had overheating issues, and poor quality reflectors; The newer Odyssea fixtures don't have these problems as they've upgraded the reflectors, and switched suppliers for the fans used for cooling the new fixtures. My Odyssea can be ran all day, and all night with all of the bulbs on the entire time, and has never overheated nor been too hot to the touch.
As with EVERY aquatic light fixture manufacturer they have all experienced issues over time, and work to correct the issues that arise. There's no such thing as a perfect fixture because everyone's tank is different, from the substrates we choose to use, different equipment used for our tanks, all the way down to perfecting our own unique dosing regime with fertilizers.
Aquarium lighting is more based on PAR data, and LUX; Because it seems he wants to stay in the low tech range for his aquarium, I find no reason to steer away from using T8 lighting. The bulbs are plenty, and really cost effective which helps the wallet stay full... The fact is I've seen some of the best planted tanks ever using the T8 diamond plate fixtures, so if he's wanting to "upgrade" without literally upgrading to a medium or high tech system the diamond plate work lights are the perfect fit.
The diamond plate work lighting fixture will give him a better reflector without actually having to upgrade to T5, T5HO, LED, or Metal Halide. It'll give him better lighting without having to add extra fixtures, and extra bulbs.