Interesting idea
Couple years ago I had a similar idea.
Back when I agreed with everyone that indoor growers were supposed to mimic the sun. I thought maybe if u had the light on a timed programable dimmer that started out at 30-40% and slowly intensifies til ur at peak 5hrs in then decrease back down.
Didn't have the desire to try it that badly obviously but I think it would work better than expected.
Now my guess on your idea
@OneHitDone is that it would work with results similar to mine. A couple t5's aren't going to do much over a 5x5 so I'm not sure they would be worth even firing up.
That being said it's a great idea that I'd love to see someone try, perhaps with a few more t5's to help get things kickstarted.
Take everything I say with a grain of salt though this is simply my guess as to what would happen. Results may vary