How many t5's for room

My room is about 4X6X8 and I've been vegging with a 4ft X 4 bulb t5, worked great but I wish i had got the 8 bulb fixture. Don't go less than 4 bulbs.
 
my grow tent is 4.5x 4.5 x 8.

But by flood table is only 2x4.

I use an 8 bulb set up. I use them for growth and Budding. My clones use (3) 24 inch


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