Another vote for the 4x54W T5HO. At least that's what I'd do if I had a tank that length. My 90 gallon is a different length than the standard 90 so I had to go with the shorter bulbs.
Yeah I second this vote. Or to save a little money, the Current-USA Nova Extreme. You'll have to replace the two actinics. I really like a 10000k and 6700K bulb combo. Its what I run on my two bigger tanks. The plus on T5s is they run cooler, and more efficient. I'm quite pleased. The Tek weighs a LOT more than the Current-USAs which have a fan I run when the second bank of two tubes is on. A Current tech told another forum member that many reefers turn off the fan if the noise bothers them - with no ill affect. Just that the bulbs don't last as long. I use both open top, BTW.
Three Tanks...Eheim 2128 & XP3-90G, Eheim 2128-65G, Eheim 2232-25G.... Tek 4x54 watt T5-90G, Aqualight 96watt PC 65G low tech, 65 watt Aqualight-25G.... Hydors-90G & 65G ... Flourite in 90, 65, & 25 Gallons, .... Auto Water Change/Auto dosing on 90 & 65 gallon..... AGA member......