What are the Uses of 2504/PSX24W Fog Lights Bulbs? Automotive by Steffy Alen - December 18, 20220 The 2504/PSX24W fog lights bulbs are automotive lighting designed to provide improved visibility in foggy or misty conditions. These bulbs are commonly used as a replacement for the factory-installed fog lights on a vehicle, and they are designed to offer a brighter, more focused beam of light that can help