I now have three of the 6.5k GE HO bulbs from Vinh over my 115 tank. And the fourth bulb is an Osram T8 Blue.
This is for a freshwater planted tank, but has a very nive look to it, and the bulbs are definitely BRIGHT. Not sure on life span yet though. I got the first one from Vinh at the meeting at Jim Norris's house. And I see some discoloration at the ends of that bulb. The other two bulbs don't show this, but it might have something to do with me running other T12 NO's with that one for a while.
All this is on the Hellolights ARO VHO ballast.