try to get them to give you square pinned light holders, they come straight and i would have loved to use the dual actinic 460/420nm bulbs instead of the straight 420's.
I have a HQI as well and was wondering if you can put in T5 instead of PC's? I was hoping I can have the HQI run 4 hours a day (12-4pm) and have the T5 run (9-12pm , 4-7pm) to conserve on energy/heat.