the main factors...

1. Light/wattage...
2. number of plants
3. room...

and finally the LAW..

Indoor growing at its maximum potential rarley calls for growing a plant more than 12-18 inches in vegataive stage.... especially when using lights of less than 1000 watts...

of course there are reasons to grow plants bigger indoors... the main one being... JOHNNY LAW... JOHNNY has a limit on how many plants yuo can grow legally...

iloveyou

example, you can grow 100 plants in a 4X6 area.. that you flower at 10-12 inches tall, using 2400 watts and harvest 5 pounds...

or you can grow 2 plants that you flower at 24 inches tall in a 4X6 area with 1000 watts and get 12 ounces total..

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