So I think everyone is right, getting an HID in there is going to be too much of a stretch.
So, for LED work, mostly in car ranges (e.g., 9-14V) but preferably with the ability to expand into other projects for a while?
As a bit of an aside - I've read through every post, and what is missing are clear consensus choices. Everyone pretty much goes with "go buy an HP/Agilent / Lambda etc on eBay", which, for a beginner, is ridiculously intimidating since it would require knowing the models, which ones are priced right, and finally feeling confident in the ability to troubleshoot it if something is wrong.