Let's discuss heat. I really don't see how it would be possible to grow without a 4" or 6" vortex fan and quality carbon filter.. Alll lights are hot, no matter what. Even a few watts of fluorescent will heat up a tent 10 degrees above ambient temps.. You have to have constant air flow and quite a bit of it. Regular fans can move a lot of air, but then how do you keep your space light-tight? Get a good fan and filter. Hurricane 4" 180 cfm fan + Can-lite filter + fan speed controller would be about the minimum
Also,attics are at the bottom of the list when it comes to choosing a place to grow. A much better option is to grow in a tent in your living area and pump the heat to the attic. Without running AC you have to have the tent in an area that remains at a constant temp in the low 70's, high 60's ..Even if you choose Quantum boards you have to have a way to pump that heat into another area/room that is separate from your grow area.
All in one kits typically aren't very good and you can do better by shopping individual pieces. The cheap tents on amazon and ebay aren't half bad.I've had good success with them. Make sure to get one at least 5 feet tall.
Here is my ordering of available light sources.
QB's
Cobs
CMH
Vipar Spectra
HPS
Flourescent tubes
CFL
Fireflies in a jar
Mars (Only because they are way overpriced compared to comparable lights)
If it says Roleadro on it just run the opposite direction.
Think about this setup (The bare bones setup)
- 3x3 Apollo Tent ($100 or so)
- 6" fan and filter combo (A real fan, not the axial fans that are made to look like vortex fans) why 6"? because if you go the route of hps all cooling elements are 6" (Maybe $180)
- 400w hps with cooltube ($150?)
- Quality nute line, ph pen (Not always necessary), ppm meter, soil, random hardware, vent pieces, hygrometer, pots, water filter, seed
Put the tent in your living area and vent to your attic. In fact you could even put the fan and filter in attic and just draw air from your tent. This would spare you some of the noise of the fan. They can be pretty noisy until you figure out how to dial them in.
There is no inexpensive way to begin growing. It's about $800 to get started. It just is what it is. However it's a fantastic hobby and very rewarding.