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You say:-
"You, personally, can discount it if you like, but the FACT (not 'it seems to me'), is that the HID is at least 10x brighter."
No it's not. It's 10x brighter at 2 tiny spots. On average it's 3x brighter. That's why people want to use them! The bulk of the arc is 6000 cd/mm2 compared with the 2000cd/mm2 tungsten filament. My own halogen projectors are terrible with a standard halogen lamp fitted. With a +90% halogen bulb (e.g. Osram nightbreaker) fitted they are a lot better. With hid bulbs they are better still, and just about bright enough.
You also say:
"Finally, a halogen projector lamp does not have a shield for a cut off."
Yes it does. Projectors lamps do have a shield. And that's why it doesn't matter that 2 tiny portions of the arc are 10x brighter because those bits won't make it out into the eyes of the oncoming traffic because of the shield.
Reflector lamp housings do not have a shield, and it's generally recognized that hid in reflectors is a bad thing because of that.
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