IMO, For more advanced plants high light with shorter time on is better than medium light on for long periods. I have an Aquatic Life Quad T5 HO on a 29g. I run two bulbs first half hour, 4 bulbs for 6 hours and back to 2 bulbs for the last half hour. With my plant/fert combination this puts me right at but not into the algae forming point. You'll have to balance the triad of carbon, light and ferts by experimentation on a high light planted tank. Keep a small notepad to log what you do as you look for what works and what doesn't. Rivercats is a great mentor on balancing. She has helped me tremendously.
Good luck and have fun with the challenge. It's worth it IMO. OS.