4 in Rally 400s deliver 392 lx at 10m of light output with a beam distance of 396 meters. Powered by 55W H3 Halogen bulbs and KC's precision designed reflectors providing extreme light output at high speeds and long distances. Fog Beam- Provides a low extremely wide angle light pattern that increases visibility below your headlights into the distance. Fog beam adds additional light to directly in front of your vehicle with side illumination for road edges. Fog beam performs well in Fog Snow Rain or low visibility conditions. The Apollo Pros were created for the most demanding off road terrains. Featuring an IP67 rated Polymax housing and built in stone guards these lights are engineered to last and perform for years to come.