7-diodes, round LED (light emitting diode) stop, turn, and tail lights. White diodes behind red lens. Advanced optics fully illuminate lens. Industry-standard PL3 socket integrated into housing. Regulated design provides voltage protection and consistent light output over entire voltage range. Skirted weld joint for added protection against moisture. Does not require 'Top' positioning to meet FMVSS 108 standard. Kit includes light, grommet and 421-491 plug.