to be allocated among buildings or ships is left to each user and
can be appropriately accounted for in the reconciliation process
(Section 3). If reliable metering of exterior lighting is in
place, this is considered the best source of an energy value. If
partial or no metering is available, the method presented here
can provide a reasonably accurate estimate.
Accountability. The level of detail at which this
energy can be accounted for can vary depending on the amount of
data available and the amount of effort expended in collecting
additional data. In most cases, an accounting of the quantity
and type of street lighting can be aided by maintenance personnel
and lamp procurement records. These may provide information
about the size and type of overhead lights that are inaccessible
without special equipment. If outdoor lighting data is not
available from maintenance or facilities sources, an inventory
will be required. If possible, the information should be
recorded on the basis of individual lamps as this will facilitate
future energy use adjustments and demand calculations in
connection with system expansions. The outdoor lighting loads
should be defined by type, number of lights, rating, and, where
applicable, kinds of use (intermittent or all night). Typical
operating hours for most standard exterior lighting include the
Street lighting - average hours, sunset to sunrise.
Security lighting - average hours, sunset to
c) Floodlighting of working areas - average hours, one
hour before sunset to end of last working shift (or one hour
after sunrise, whichever comes first).
d) Parking lot floodlighting - average hours, sunset
to one-half hour after end of last working shift, plus duration
of special events requiring evening use of parking lots (the base
security office may keep records of such special off-hour uses).