Whelen L21 Series Super LED High Profile Warning Beacon

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This is a SAE Class 1, high dome, Whelen L21 Series Super-LED beacon that is fully encapsulated for resistance against moisture, vibration and corrosion. The hard-coated dome provides extra protection against environmental damage. This light is rated for thousands of hours of reliable use. This beacon is available in combination, magnetic, or magnetic/suction mount. Combination mounting modules feature 25 Scan-Lock alternating and simultaneous flash patterns, including steady-burn. Combination mounting modules have additional mounting options; these options are 1” pipe mount, permanent mount, and J-hook mount. These combination mounting beacons include a 6” pigtail and can be synchronized with up to 8 beacons. Magnetic mounting modules have 75 SignalAlert flashes per minute standard, 25 Scan-Lock flash patterns to choose from. These magnetic mounting beacons include a 10’ straight cord and a cigar plug with an “On” LED indicator. This cord with the cigar plug also has an On/Off switch and a pattern control selection switch. The magnetic mounting models do NOT include cruise light, low power, or SYNC functions. This light is covered under a 5-year warranty.


  • 12 VDC
  • L21 is SAE Class 1 Certified
  • High domes meet SAE J845 Class 1 360° certified specifications
  • Rated for thousands of hours use
  • SmartLED® beacon design
  • Polycarbonate base
  • Combination mount features 25 Scan-Lock alternating and simultaneous flash patterns, including steady burn
  • Combination mount has additional mounting options of 1” pipe mount, permanent mount, or J-hook mount
  • Combination mount beacons are supplied with a 6” pigtail
  • Magnetic mount: 75 SignalAlert™ flashes per minute standard, 25 Scan-Lock™ flash patterns to choose from
  • Magnetic mounts are supplied with 10' straight cord and cigar plug with LED "ON" indicator On/Off switch and pattern control selection switch
  • Magnetic mounts are 12 VDC Only
  • 80 lb. magnetic mounting base
  • Magnetic and magnetic/suction mount models do not include cruise light, low power or SYNC functions
  • Fully encapsulated for moisture, vibration and corrosion resistance
  • Available in combination, magnetic, and magnetic/suction mounts
  • Hard-coated lenses minimize environmental damage from sand, sun, salt, and road chemicals
  • Virtually no RFI/EMI radiation
  • Five year warranty