then look into LED
fixtures. you will need 3 of them and you can get decent ones at around 400 a piece. as potent as halides with much less electricity usage and virtually no heat.(not all LED
fixtures are created equally, so please research them, and by research, i don't mean hearing one person's short experience and considering it law)
if you are still stick on halides, i would buy 3 of these-
Lumen Bright Pendant Kits | CoralVue
they have the highest reflectivity in the industry.
of you can squeeze a couple extra bucks, i would say this is the very best metal halide fixture you can get-
Lumen Bright/T5/LED Aquarium Lighting Fixture | CoralVue