I'd suggest a T8/T12 GE Plant/Aquarium bulb(easiest to find, usually). Most other major manufacturers also produce PL/AQ bulbs.
These are not readily available in T5 size. Though I'm fairly sure you can find them on-line, as well as CFLs for plants.
Plant-specialty bulbs produce over 2x the amount of usable light for plants in the correct frequencies. They're typically a pink/purple glow. These bulbs are highly lacking green light output, as plants reflect green light(which is why they appear green, objects appear as their colors because they reflect that color and absorb all others).
Oh, they're also around 10x cheaper than T5's. Which maximally produce 25% more light. Most of it not plant-usable.