I read through some of the articles from that guy, Daniel, and he seems to know what he's talking about. And, like you, I don't know a whole lot about it, so I choose to believe him.
I think I saw some guy on YouTube say to get LED bulbs that mimic the H4 bulb for retrofitting a halogen lamp. He's probably right that that's the best you can do but as Daniel points out, it's not good enough.
I had an email conversation with a guy on the yahoo group about LEDs. IIRC, he chose an H4 replacement. He said it was much brighter and probably due to how low his car was, he didn't get a lot of people flashing back at him so he was pretty happy. So I would suggest that the height of the lamp is an important variable and that maybe a little leeway on a worse beam pattern as long as it doesn't blind oncoming traffic (although I've been blinded by xenon or LED bulbs found stock on big pickup trucks).
That's a good link. I'll have to go back and check out your previous links.
