You can disagree all day long but you're lacking in your information and your disagreement and use of HID in fog lamps shows this. What I am saying is it is useless to bother upgrading them for the few times you may use them. Ask DS about yellow bulbs if you choose. I have had this conversation with him, they are useless. They may look pretty but do little and in-fact reduce lumens by up to 20% due to the coating. You're wrong on using HID for fogs. You need to read more on his site.
From Sterns Site:
http://www.danielsternlighting.com/tech/lights/fog_lamps/fog_lamps.html
"So, what is a good fog lamp? A good fog lamp produces a wide, bar-shaped beam of light with a sharp horizontal cutoff (dark above, bright below) at the top of the beam, and minimal upward light above the cutoff.
Almost all factory-installed or dealer-optional fog lamps, and a great many aftermarket units, are essentially useless for any purpose, especially for extremely demanding poor-weather driving. Many of them are too small to produce enough light to make a difference, produce beam patterns too narrow to help, lack a sufficiently-sharp cutoff, and throw too much glare light into the eyes of other drivers, no matter how they're aimed.
Good (and legal) fog lamps may produce white or Selective Yellow light—it is the beam pattern, not the light colour, that defines a fog lamp—and most of them use tungsten-halogen bulbs though there are some legitimate (and a lot of illegitimate) LED fog lamps beginning to appear.
Xenon or HID bulbs are inherently unsuitable for use in fog lamps, and blue or other-colored lights are also the wrong choice."