cfl bulbs from walmart?!?

Genosyde said:

it should work, but the rule of thumb is 100 watts per plant and 50 more for each additional plant/10'000 lumens per square foot. so just to the math with the L' x W' that you are working with. smoke on

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im just looking to veg with cfls, i have a box that is 21.5 inches - width, 18 inches - height, 21.5 inches - deep

looking to veg about 10-12 plants

how many watts am i looking at? and what is the cheapest way to achieve this wattage?

thanks in advance