fishwhistle
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T5s are great for veg if your worried about heat and probably unbeatable for propagation,I like to use a combination,t5 in the beginning and MH in the second half to toughen them up and prepare them for the flower room but alot of folks use t5 all the way through veg with stellar results.I never understood trying to flower under them though,an 8 bulb t5 badboy uses 2.5 amps @240v and 5 amps @120v and thats pretty much what a 600 uses energy wise and the 600 has a better footprint and penetration to boot,no comparing the two in flower.