What he said :lol: it's all spot on.
With t5's you have 2 options - t5's and t5 HO's.
the HO stands for High output - these are really bright, and if you get a hood that matches the length of your tank, and will provide sufficient light for a tank of that depth.
Be warned though - they are usually pretty expensive, and your plants will grow really well.
If your concern is plant growth think about JBL balls in the substrate too.
HTH