There are a lot of bulbs being sold on eBay - and in local stores - that are advertised as "Xenon", "HID simulation", "Plasma", whatever they are called, that promise "Brighter light!", "55w - 90w", "Improved...
Here are some samples of some fog and driving lights that I sell on eBay. Question: Why are fog lights yellow? Does it help that they are? Does it matter if you are driving in city or countryside? ...