Help with Grow Setup please

Hey so i'm an obvious first time grower and started growing under my stairs with some fluoro's for about 7 weeks (first 2 pics) they seem pretty small. Now for some reason I thought I could cheat my way thru this and keep them there but there is to much light penetration. So I thought getting a tent would be the cheapest and simplest option. Now i found a good one for about $120 and a 400w HPS/MH kit with ballast for $160cdn!(next 2 pics) Anywhere else is Ontario is 3x the price. Also this store is only 45min away so free shipping via my car heh. Anyway $280 later I now realize i have to ventilate the crap outa this thing. so found a carbon scruber + 340cfm inline fan combo for $250cnd and thats all i have found so far but i'm guessing i'll need one more fan at least (not inlcuding a simple rotating fan on plants).

Now my other option is this store sells LED lights. Does anyone know how many watts of LED light are equal to a 400w HPS? The store is selling a "120W Quad Band LED GROW LIGHT UFO 120 WATT - SPECS 660R 460B, 610O" (last pic) for $180. So i was thinking if I got 2 of those could i skip out on alot of that ventilation stuff since it won't really get much heat?

i'm at a crossroad and gotta think of something soon. Also gonna replant them into larger pots once I start to flower.

Any help, tips, advice very appreciated bongsmilie
 
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