The fella behind this site might also have any new info if someone ask
You can't assume that a website is "great" just because you think the technical information looks science-y. Nor can you assume that something you see here is "mis-info" because you read something contrary on another site. Dan Stern told me a very interesting story about "the fella behind that site" you like, one Mr. Fox. Seems Mr. Fox, in the process of setting up his website, sent Mr. Stern half a dozen e-mails asking questions about the HIR bulbs...then pasted together all of Stern's answers,
minus the important but inconvenient parts that might tend to alert would-be buyers that HIR bulbs are not necessarily an appropriate retrofit for any/every lamp originally using 9005/9006, and used the resultant hacked text as the technical "info" on his site. Kinda slimy if it's true. I think it probably is, because:
1. Stern's answers to my questions about HIR bulbs look a lot like the "info" on that site you like, except Stern is careful to go into detail about which kinds of lamps should not be retrofitted with HIR bulbs
2. Stern has a solid track record of telling the truth
and doesn't sell the HIR bulbs himself so has no reason to make up such a story.