If you are looking at the retro kits, the 2x48 has 54watt bulbs. So you can go whatever lenght you need, they have 24", 36", 48" and even 60", the 60" is not online.
Oh, you'll have to use 54watt if you need a 48" bulb, that is just the wattage of a T5, it's a High Output bulb. So you'll want to make sure you have an electronic ballast that is capable to handle the wattage for the bulbs.
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