Gondore, you can simply use one of the lower par halides if you dont need all the par. Something like the Reeflux 12000K or the XM 15000K or XM 20000K are lower par halides with par more like that of a higher par 150 watt DE, especially on electronic ballasts. There are several others as well. They may very well be enough to keep high light corals when you decide to go with SPS and at that point you can place the higher light corals up higher in the tank and still keep the lower light corals if you want a mixed reef. If down the road you decide to keep only sps you can just switch to a higher par halide and be able to place high light lovers wherever you wish to.
As far as the Icecap 660, I was just letting you know that it does overdrive the T5's more than the 430 (which was a surprise to me). You will probably be fine with the 430. Just wasnt sure whether you wanted to fully overdrive the T5's.
There are many reefers with halides inside canopy that do not use or need a chiller. Get some advice from canopy users on how best to vent and place fans in the canopy for most effective cooling. I know that having an open back or a back that can open or close can help a great deal. Obviously the more open area available for heat to escape or be exhausted out of, the easier to get the heat out. I think with smart design of the canopy and fan cooling you will be fine. Again, post to the canopy users with halides for best advice and ideas. I dont use a canopy, my tank is an in wall (fish room).
As far as the Icecap 660, I was just letting you know that it does overdrive the T5's more than the 430 (which was a surprise to me). You will probably be fine with the 430. Just wasnt sure whether you wanted to fully overdrive the T5's.
There are many reefers with halides inside canopy that do not use or need a chiller. Get some advice from canopy users on how best to vent and place fans in the canopy for most effective cooling. I know that having an open back or a back that can open or close can help a great deal. Obviously the more open area available for heat to escape or be exhausted out of, the easier to get the heat out. I think with smart design of the canopy and fan cooling you will be fine. Again, post to the canopy users with halides for best advice and ideas. I dont use a canopy, my tank is an in wall (fish room).