I have a 115g tank, 24" tall, with T5 lighting, 4-54watt bulbs, 2 "aquablue" (11000k) and 2 "Actinic+" (blue) bulbs. The tank is all softie but looks pretty nice. I probably could have fit another 2 bulbs over the top, but it's a flip top canopy and is a tad crowded as it is.
Ok technically I have a VHO actinic bulb over it too, but that's for after lights coloration only.