Fog Lights are ment to be Yellow, but unfortunately we are HID Found people. We only know one light that is HID.. no matter is a cheap china quality people go for it without thinking about its durability and Reliability.
just for information, Fog Lights are always good with Regular bulbs but some rare people like me and around the world paint their Fog Lights Glass YELLOW and thats a perfect combination for Fog Purpose. and on the other hand thats the Decent JDM Style.