UFC 3-535-01
17 November 2005
6-7
POWER REQUIREMENTS
Depending on the equipment installed, the power may be from a series circuit or 120
volt multiple circuit. For flashing lights the power is usually 120 volts. Emergency power
is not a requirement but is desirable if readily available.
6-7.1
Intensity Requirements
See Table 6-1 for required intensity levels.
Table 6-1. Required Effective Intensities of Obstructions Lights
Minimum
Minimum
Intensity
Intensity
Beamspread
Horizontal
Peak
Step
Vertical
(degrees)
(candelas)
(degrees)
Steady-burning red lights
Full
10
360
30-150
Flashing red beacon, medium intensity
Full
3
360
2,000 25%
Flashing red beacon, rotating
Full
10
360
20,000 min.
Flashing white beacons, medium intensity
Day/Twilight
3
360
20,000 25%
Night
3
360
2,000 25%
High-intensity flashing white lights, towers and stacks 1/
Day
3 to 7
360
270,000 25%
Twilight
3 to 7
360
20,000 25%
Night
3 to 7
360
2,000 25%
High-intensity flashing white lights, transmission line supports 1/
Day
3 to 7
180 or 360
140,000 25%
Twilight
3 to 7
180 or 360
20,000 25%
Night
3 to 7
180 or 360
2,000 25%
Vehicle obstruction beacons
40 min. 400 max 2/.
Full
10
360
1/
Multiple lights may be used to obtain horizontal coverage
2/
The minimum and maximum are for the horizontal plane, but the peak may
be greater at higher vertical angles.
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