TM
5-811-1/AFJMAN
32-1080
inversely proportional to the time power is off. The
activity, as defined in chapter 10, luminaires may
provide both security lighting and area or roadway
lamp will restrike at approximately full lumen
output only with a momentary power outage. Once
(3) Entry points. Luminaires with symmetrical
the outage time reaches 30 seconds, the lumen
light distribution and a medium to wide spread
output approaches zero at restrike and the time
beam are suitable for entry point lighting. Lumi-
required until full lumen output is 3 to 5 minutes.
naires will be aimed at checkpoints from several
The use of restrike systems should be carefully
directions to facilitate inspection.
engineered to achieve the desired minimum illumi-
(4) Special purpose applications. Special pur-
nation levels required.
pose applications may require use of spotlights,
(3) Uninterruptible power supplies (UPS). The
floodlights, or searchlights, depending upon the
UPS will not normally be used for security light-
type of security required. Searchlights are appro-
ing systems. If the using agency or other criteria
priate where it is necessary to spot moving objects
specifically requires the use of UPS, the contract
at great distances; the beam spread will be only
documents must clearly identify the nonlinear
about 6 degrees. Size and candle power of search-
nature and switching patterns of the load to be
lights depends on the length of throw required,
served. The UPS designed for computer loads will
and the atmospheric conditions encountered. A
not perform satisfactorily for lighting applications.
1,000,000 beam candle power searchlight (approxi-
mately 1,000 watts) has an effective range of
11-8.
Luminaires.
approximately 1,000 feet. Where stationary light-
a. Type. Luminaires will be of the enclosed type
ing must be supplemented, truck-mounted units
with light distribution characteristics selected for
are available, but provision of such units is not the
the type of lighting system required. Characteris-
designer's responsibility.
tics of roadway type luminaires are discussed in
11-9. Wiring and Control.
chapter 10. Table 11-2 describes various beams
a. Wiring systems. Multiple systems will be
and classes of floodlights which are appropriate for
installed, except where their use is clearly imprac-
security lighting applications. Floodlighting lumi-
ticable. The circuit protective devices, transformer,
naires will have a heavy-duty enclosed outer hous-
and wiring will be within the restricted area.
ing and a separate removable inner reflector.
b. Specific usage requirements.
Wiring will be located underground to minimize
(1) Boundaries. For boundary isolated area
the possibility of sabotage or vandalism. Equip-
ment and design will provide for simplicity and
applications, glare projection luminaries may be
economy in system maintenance. To minimize
used which have the rectangular distribution pat-
security degradation during faults, feeders may be
tern that a floodlight with a wide horizontal
3-phase, 4-wire with single pole overcurrent de-
distribution and a narrow vertical distribution
vices at the service equipment. Consecutive lumi-
(type 6 by 2) provides. For controlled lighting
naires will be connected to alternate phases of
applications, use luminaires with wide lateral
3-phase feeders. Supplemental in-line fuses will be
beam spread that roadway luminaires with IES
placed at individual poles.
type I through III distribution or floodlights with
b. On-off control. On-off control will be auto-
wide horizontal and medium to wide vertical dis-
matic, manual, or manual/automatic as appropri-
tributions that types 6 by 3, 6 by 5, and 5 by 3
ate.
would provide.
(1) Automatic. Boundary and area lighting
(2) Sensitive inner areas. Inner area lumi-
on-off control will be automatic and will be acti-
naires will have the circular symmetrical distribu-
vated during periods of darkness or at other times
tion that a roadway type V or floodlight 4 by 4
when visibility is reduced or by electronic security
and 6 by 6 would provide. Where there is a
systems. In hostile environments, automatic on-off
general area lighting requirement for nighttime
Table 11-2. Floodlight Beam Descriptions.
11-5
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