Steve,
http://www.reefcentral.com/vbulletin...asaki+resistor
That should explain it [img]images/smiles/icon_smile.gif[/img]
Yah...just tell them you want a Metal Vapour ballast and capacitor (if required for that ballast). Iwasaki is a MV conversion lamp -- a MH lamp design to run in a MV ballast.
- Victor.