11
Installation and Maintenance Manual
Federal Signal
www.fedsig.com
Overview
Ambient Light Sensor/AutoDim Option
Allegiant light bars larger than 21 inches can be ordered with an optional ambient
light sensor. The sensor that detects the ambient light and automatically dims flashing
lights during nighttime is located on the Passenger Inner ROC board. If used with
a controller that has a dedicated dim button, the user has the option to temporarily
override the dimming. For Serial bars, AutoDim is disabled in MODE 3 and is enabled
when MODE 3 is removed. For Discrete bars, AutoDim is disabled in MODE 2.
Other advanced features of the Allegiant light bar include:
• A high degree of reliability through the use of advanced microprocessors and
other integrated circuits.
• High output, long-life LEDs with no bulbs to change.
Product Specifications
Operating and technical specifications for the Allegiant light bar are listed in this
section by model.
Table 1 Dimensions
Model
ALGT21
ALGT45
ALGT53
ALGT61
ALGT70
Length
20.7 in (52.6 cm)
44.5 in (113.0 cm) 52.7 in (133.9 cm) 60.9 in (154.7 cm) 69.1 in (175.5 cm)
Height
1.8 in (4.6 cm)
11.2 in (28.4 cm)
11.2 in (28.4 cm)
11.2 in (28.4 cm)
11.2 in (28.4 cm)
Width
11.2 in (28.4 cm)
2.0 in (5.1 cm)
2.0 in (5.1 cm)
2.0 in (5.1 cm)
2.0 in (5.1 cm)
Weight* 10.0 Lb (4.536 kg) 23.0 (10.4 kg)
26.6 (12.1 kg)
30.2 (13.7 kg)
33.8 (15.3 kg)
*with standard mounting feet
Table 2 Light Specifications
Lighting Option Current Draw
Lamp Technology
Reflector Style
LED (all heads)
1.0 A in Steady-Burn Mode High-brightness LED Offset, compound curve,
polished reflector
Table 3 Electrical and Temperature
Model
Electrical Potential Current Draw
(50% Flash Rate)
Operating Temp.
ALGT21
12.8 Vdc
7.0 A
-40°F to 149°F (-40°C to 65°C)
ALGT45
12.8 Vdc
9.0 A
-40°F to 149°F (-40°C to 65°C)
ALGT53
12.8 Vdc
11.0 A
-40°F to 149°F (-40°C to 65°C)
ALGT61
12.8 Vdc
13.0 A
-40°F to 149°F (-40°C to 65°C)
ALGT70
12.8 Vdc
15.0 A
-40°F to 149°F (-40°C to 65°C)
