I am thinking about changing my fog lights to either 3000K HID Conversion kit or just some 20 bucks Super Yellow Halogen bulbs.
I have seen them side by side before and somehow I think those super yellow halogen bulbs appear much yellower than the 3000K HID Conversion Kit, so is the HID kit really worth the investment?

 

Look here, you have 4 posts and each of those were used making 4 threads. Condense that **** into one.

Now to answer your question, yes the HID conversion is worth it simply for the brightness. If youre looking for a deep yellow color you can install yellow glass capsules inside your fogs or you can do like a yellow Lamin-X overlay.