Are the Phillips really an exact match? They list the color temp as 6000k, where the factory HIDs are certainly not 6000k
They are a dead on match for the LED DRL's. They are really close to the HID headlights when looking straight on looking into the beam, as if you were an oncoming car. The HID's are a little "less blue" when you are looking at them from the side compared to the LED fogs. All around they match much better and are certainly brighter than the stock lamps and seem have a bit more reach.
That being said, true fog lamps are going to perform better if they are 2500k-3000k range and pure yellow - you get better penetration and less reflection in snow and fog with the lower wave length. The contrast between your fog and driving lights gives you better/different depth perception. The lower placement of the fixtures also helps create shadows by road imperfections making them easier to see, and of course a wider light field so you can track road lines easier.
Its really a personal preference thing, but I can say I had OCD issues with the stock halogens and I feel much better knowing things match up better now, lol, I sleep better... If the color match doesn't make you twitch, save your $! If you want better fog visibility and contrast, get yellows.
I did try taking pictures at different angles at night with different combos of lights with my phone but the iris is open so far that the subtle color differences are lost.
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