I currentley light my 72"x18"x24" tank with 2 125watt Mercury Vapour pendants but today one of them has packed up, I changed the bulbs over so I know its the unit, but the type I have dont seem too be available anymore as I dont seem too be able too find them on the web, they arte the Black Bowl shaped ones made by Geismann, so what I need guys is some ideas on how too get the same wattage of light without costing the earth, Iwas thinking of an Arcadia Lumineire or similar any ideas guys !!!!!