There is more to this than you may think, what is it that you want this lamp to do? I use a 4 bulb T5, does it work well for what I want it to do? Yes. They are kept very close to the top of the plants 2-3 inches maybe, so the foot print that you can grow under is pretty close the actual size of the lamp. Is heat a problem for you? It is for me and the T5s generate very little heat like Tea Tree said, I don't use a real fan either, I don't need it there. The other limiting factor is the height of the plants, how tall do you veg before flower? 12-18 inches you should be OK. If you need a 13mm socket wrench use that, if you need a #1 phillips head screwdriver use that. It's the right tool for the right job. I hope that this helps a little, I don't think that the hydro man is over selling. He wants you to have success and come back, think about what's best for your needs and you make the decision. My Hydro man tried to talk me out of the T5 also and I don't regret buying it, it works for me. My ambitions are modest so who knows. Good luck with your adventure and remember, your results may vary.