LED Back-Up


4" Round Back-Up Lightning Series -A, Surface Mount

model number: M42321-A

The M42321-A is a surface-mounted 4” round back-up lamp. It features our patented Lighting Optics lens for superior off-axis visibility. It is DOT FMVSS108 compliant in either 1-lamp or 2-lamp configurations. This light features a polycarbonate housing and lens and is backed by a 5-year warranty.


  • DOT FMVSS108 Compliant for 1-Lamp and, 2-Lamp Simultaneously
  • 3-Hole Surface Mount
  • Patented Lightning Lens Optics
  • US Patent No. 8,009,364 and 8,717,679B2
  • Polycarbonate Lens & Housing
  • 5 Year Warranty
  • Replaces M42321


  • LEDs: 18
  • Voltage: 12.8VDC
  • Amp Draw: 300mA
  • Dimensions: 5.5" Diam. x 0.9"D
  • Mounting: 3 Hole Surface, 5" Bolt Circle
  • Connector: 2 Leads, Blunt Cut, 12"
  • Legal Heading: R
  • DOT/SAE: J593