Well, I just recieved an email from a very helpful person who had seen this post, which informed me that the blended lamps are sold by a company called International Lamps. They don't have a version without the phosphor, but they do have a 160W reflector version similar to
this which would serve my purposes well. I haven't actually figured out yet whether they sell to indoviduals yet, or just companies...but I've only been on the site for about 2 minutes. Can't actually see a pricelist on the page in question either, but I'm sure I'll figure it out. They sure have a lot of lamps though, including a few oddball ones, the Mercury blended (What's the prefix code for a blended lamp??? MB is high pressure, so it ain't that...would just save me having to type it out each time, and it's annoying me) ones mentioned here.
Well, here's the website address, might well be of use to someone else here too.
International Lamps website.