shall not be used for CCTV.
Two types of infrared luminaires are currently
available. Fixtures with special lamps utilizing
optical dichroic mirror coatings that produce only
infrared light and fixtures that use conventional
lamps that pass the light output through infrared
filters. Special lamps have the advantage of
operating cooler and not requiring a cooling fan,
thus operating quieter and requiring less
maintenance.
The major disadvantages are high lamp replacement
cost due to short bulb life (2000 to 4000 hours) and
special lamp design. The 2000 hour lamps produce
more infrared light energy and are preferred over
the 4000 hour lamps. Another disadvantage is the
limited variety of wattages available, but this is
normally resolved by fixture placement during site
lighting system design. Conventional lamps
utilizing special power supplies and infrared
filters have the advantages of low bulb replacement
cost and bulb life ranging from 1700 to 18000 hours.
(Note: Special power supplies reduce current flow
to the bulb and allow it to operate at a lower
filament temperature to shift light output more into
the near infrared (NIR) light spectrum and requires
less filtering. This has the additional advantage
of extending bulb life.) A variety of bulb sizes
are available and no special bulbs are required.
The main disadvantage of using a conventional bulb
is the heat generated utilizing an infrared filter
which must be cooled by a cooling fan. Fans require
maintenance and the loss of the fan will destroy the
filter. Filters are expensive.
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1.1
REFERENCES
**************************************************************************
NOTE: Issue (date) of references included in
project specifications need not be more current than
provided by the latest guide specification. Use of
SpecsIntact automated reference checking is
recommended for projects based on older guide
specifications.
**************************************************************************
The publications listed below form a part of this specification to the
extent referenced. The publications are referred to within the text by the
basic designation only.
ALLIANCE FOR TELECOMMUNICATIONS INDUSTRY SOLUTIONS (ATIS)
ATIS O5.1
(2002; R 2003) Specifications and
Dimensions (for Wood Poles)
SECTION 16528A
Page 6
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