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This is an interesting problem.
First I would recommend only external ELECTRONIC metal halide ballasts . You will be producing considerable heat and they run cooler. Also an electronic ballasts can run a variety of lights instead of one preferred bulb type.
I would also consider a simple lighting design that gives you what you want. For example 2 X 400 watt moguls with Luminarc reflector as daylight bulbs in the 10-14K range, and a series of VHO bulbs. I wouldn't mail order anything over 48". T5HO are popular but require more bulbs with a mix of actinics and white bulbs to suit your taste. I wouldn't get many or any HQI 20K bulbs as I have found VHO to have much better coloration at dusk.
Am am very pleased with my lighting on a 48W 24W 28D. I Use 250X2 HQI 14K and 1 t5 actinic and 1 t5 daylight. I have the option to run another 150W HQI but don't currently. (previously 20K).
I would also go with smaller tank. I don't expect you to understand till laterr.....
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