Stop in for a cup of coffee

I don't know man. He's about as close to the last word as I can think of. The one instance I used was a real exception because of location and performance level. Other than that, he's right. And as for his lighting expertise, I can think of none better.
I'll go with none better.
But its been interesting to see how what he recommends and says has evolved. I'll give you one example. He used to really deride US headlights. Then some years ago he came around to recognizing there were strengths and weaknesses in both US and Euro lighting standards. Further that there were different levels of quality in lamps and bulbs so making blanket starements that one is 'good' or 'bad' is generally not accurate or helpful.

That's a critique, not a critisism. IMO its a sign of professionalism that he's interested and willing to learn.
PS. My example above is not a secret. I you dig around here (or if not here then Candlepower forums) he's posted about his changing perspective on that topic.