Depends on what you're trying to achieve. For seedlings and the first week of growing it'll be enough light. For anything beyond that you're going to need a lot more light (especially during flowering).

If you want to go down the T5 fixture route, you'd be best off investing in some high output ones like these:

Tek-Light T5 4FT Fluorescent Grow Lights - Plantlighting Hydroponics & Grow Lights

remember, you're going to want at least 3000 lumens per square foot.

Take the length of your grow area in feet, multiply it by the width and you'll have the area - e.g. 3'x2' = 6' square. 6 feet square x 3000 lumens = 18,000 lumens.

Stick to 3000 lumens per square foot (up to 5000 if you can) and you can't go wrong.