Best 150w Bulb?

Is there a better bulb then a standard 150w hps bulb? And do they make a 150w MH converstion. I have a 150w sun system hps. And i want to get either a better hps bulb for this thing like a hort if they make one and a MH conv if they make one. Thanks

im not sure if hort makes them or not but here is a link to a plant max bulb, im sure it would work just fine. and only $24
http://cgi.ebay.com/Plant-Max-150-Watt-HPS-Bulb-16-000-L-/260586228712?pt=LH_DefaultDomain_0