Upgrading Halide from 150-250

[sailfintang]

I am in need of some assistance form any one who has had experience wiring or upgrading metal halides. I currently am running the Sunpod 48" with 2, 150 watt metal halides and am wanting to upgrad the lights to 2, 250 watt halide. I was wonder if I would be able to remove the current ballasts installed inside and replace them with 1 dual 250 watt HQI ballast and rewire the 150 connectors with the 250 connectors from hello ligths listed here:

http://www.hellolights.com/index.asp...ROD&ProdID=166

http://www.hellolights.com/index.asp...ROD&ProdID=168


Please let me know what would be best to preform the upgrade here is the link to the light I currently am using Model number is 1064:

http://www.current-usa.com/sunpod.html