best light for overdriving NO on VHO

I'm using F32T8 6500K lamps $3.65 each at Home Depot. They are a little yellow, but my blue actinics balance out the color.
 
You can also get 6500k t12 bulbs. I like t8's because they take up less space. I make my own endcaps. A short piece of 1" schedule 40 PVC with a PVC cap, solder the wires directly to the bulb terminals, drill a hole for the wires, seal it up w/ silicone.
 
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