lol customer rating on this bulb
"I purchased this bulb to grow vegetables indoors and it works great. It's been on an outlet timer with an eighteen on six off cycle for about two months and it's still going strong. The bulb gets hot to the touch but not hot enough to burn the plants at five inches away. The plants are flourishing and the bulb is obviously a key factor."
yeah vegtables.....mmmmmhmmmmm. i should tell the dude that 2700k is not for Veggatative growth LOL
I would recommend a larger number of smaller bulbs than fewer larger bulbs. You get much stronger more even light dispersal and can run more wattage for the same price.
Say you purchased 3 of these 36" 6 bulb fixtures for $13 each (look around you can probably find the same fixture for $6) http://shop.ferguson.com/product/Cr...vanitylights&gclid=CLvY3eaNwawCFQNShwodbztWrg
Look for 23-26w CFLs at the dollar store or on sale - you should be able to find them for $0.25-1 a piece. For $60 you would get 400+w of CFL and it would be nice and evenly spaced over a 3x3' area (perfect for a scrog). You would also be able to stagger different spectrum bulbs to maintain the ideal 3:1 ratio.
Also keep in mind CFL efficiency; CFLs are most efficient lumen/w at 45w. The further you get away from 45w the less efficient the bulbs are - 23w and 68w bulbs are about the same as each other and just a bit less efficient than the 45 an 48w bulbs, the huge bulbs and tiny tiny bulbs are much much less efficient.
In short you will be providing alot more light to the plants by using separate smaller bulbs placed closer to all the parts of the plant then just a couple larger bulbs close to parts of the plant but far from other parts of the plant (keep in mind anything over 4" from a CFL is pretty far).
If you mounted those bathroom vanity lights to a sheet of plywood they would take up just as much vertical space as the two larger bulbs.
You would be better off with 4 45w bulbs than 2 105w bulbs. If you can only put two bulbs then get the highest wattage you can - it's less efficient light but it's still more of it.
11x14 inches? Oh... In a space that small and with the longer straight high wattage CLFs I would really recommend hanging them vertically and growing lollipops with the bulbs hanging parallel to the colas. It is going to be really really hard to get a good scrog in such tight conditions. Maybe just top once and then trim for 4 main tops - anything over 4 tops is going to be way overcrowded.
Let me know if you want me to get rid of all of these pictures.
i was going to try for around 12 tops. 4 tops just seems like its not trying to push the limits of my space enough and thats the main idea.
but your more than welcome to say "Told ya so" when i dont succeed![]()
12 seems like a lot to me but Id much rather you say "told ya so"![]()
I'm rooting for you.
What is your ventilation situation? Generally more light the better but I can't imagine say 2 250w CFLs in there - the heat would just be ridiculous and although the amout of light at the top would be super high I don't think it would be able to get to much of the plant matter and changes are you would just be wasting electricity. I would say go with x2 105w like you were thinking - even then you might have heat issues.