HPS's are fine to grow the plants/macro's, but I think size, mounting, light spread etc, the PC lights are hard to beat,
www.ahsupply.com has cheap kits with excellent reflectors, easy as pie to add to any set up. Light weight and low heat, bulbs last for at least 2-4 years. I have some running that are over 5 years old.
Anyone that gets rid of the their old PC bulbs before they fry please send me yours! Corals I replace after two years, but macro's go till the bulb dies.
I've done the HPS, MV route. It's hokey, big, awkward, PITA in the long run.
It works. You can Homr Dpot it for about 1/ the cost and thy also hav those Lights of America 65w PC outdoor fixture with a 6500K bulb for about 30$ but the bulbs fry after a year or so.
If you shop around for the PC bulbs, 55watters can be had fairly cheap and the A&H kit is great.
For a sump under a tank, this is one of the best options.
Regards,
Tom Barr