Federal Signal’s Model 121S is a compact, rotating warning light designed for in-plant use. It features a parabolic reflector which rotates around an incandescent lamp, providing 60 flashes per minute in all directions.
Federal Signal’s 121S comes ready to mount on a 1/2-inch NPT pipe or surface mount. Optional brackets simplify installation on walls or in corners. The enclosure is also rated Type 4X for a water-tight and dust-tight seal.
Model 121S features a twist and lock lens which allows for fast and easy access to inspect and change the lamp. 
This light is ideal as a signaling or warning device in high ambient noise areas where it can supplement audible signaling devices.


Mount 1/2" Pipe
Voltage 120VAC 50/60Hz
Operating Current 0.36 Amps
Lamp Life 3,000 Hours
Light Source/Lamp Style Incandescent
Flash Rate/Minute 60
Peak Candela 2100
Operating Temperature Minimum -31 °F
Operating Temperature Minimum 150 °F
Enclosure Rating Type 4X
Ingress Protection (IP) IP66
Dome Colors Amber
Net Weight 2 lb
Shipping Weight 2.10 lb
Height 6.260 in
Diameter 5.130 in

Ordering Information

Model Types
Model Description UPC
121S-120A Rotating light, 120VAC, surface or pipe mount, amber 782979284901
121S-120B Rotating light, 120VAC, surface or pipe mount, blue 782979284802
121S-120C Rotating light, 120VAC, surface or pipe mount, clear 782979285007
121S-120G Rotating light, 120VAC, surface or pipe mount, green 782979386308
121S-120R Rotating light, 120VAC, surface or pipe mount, red 782979284604
Product # Description UPC
LCMB2 Mounting bracket, corner 782979253709
LWMB2 Mounting kit, wall mount 782979253808
Replacement Parts
Description Part Number UPC
Dome, Amber, 121 Light K8444357A-02 782979122920
Dome, Blue, 121 Light K8444357A-01 782979122913
Dome, Clear, 121 Light K8444357A 782979122906
Dome, Green, 121 Light K8444357A-04 782979122944
Dome, Red, 121 Light K8444357A-03 782979122937
Incandescent Lamp, 40W, 120V, Series C K8107251A 782979125525
Lamp, Incandescent, 120V, 25W K8107181A 782979118190