I am thinking of upgrading to two 250w Reef Optix HQI pendants on my 75g. Currently I am running a 660 with 2 10K and 2 super actinics, which is a very nice white/blue light. I was thinking or running 20K XDE bulbs HQI bulbs without actnincs when I upgrade, any thoughts? I have always been a VHO man so I dont have alot of experience with MH bulbs. Any help would be great.

Thanks-Greg