Tsomething Veg Light

I have no idea what the difference is between t5, t8, t10, t12, t whatever lights. I know the color signature is different but am not sure which set up to buy for my particular use. I need a strickly veg light. I want something that draws less power than a mh set up but has enough power to allow my cutlings to grow and keep my mothers producing clones. I see these t5 set ups flying off the shelves but if a different set up would suit my needs even more rather than a pricey t5 set up, I'd like to save some cash. I like saving $. Suggestions?
 
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