I started with just a 4' 2 bulb fixture with 6500k bulbs
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Needed more light as they grew so added 1 more 4' fixture
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By the time I was ready to flower I added 2 more plus "hyper-chargered" doubling the ballasts for 1.7% more output.
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Getting ready to harvest my first crop with great results!
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I have decided to go with 4x the ballasts after harvest bringing my watts up to 128 per x8 bulbs... That's 1024 watts! Considering the 1000's of hrs the bulb are rated for, who cares if it cuts the life down. I have not burned out one bulb yet.
Now I am vegging under a T5 and keeping the hyper-charged just for flower. These girls are almost ready for flower.
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I am sold on the hyper T8s. Lots of quality light for very little out of pocket with no real impact on the power bill and no heat!!!
Peace