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building's cooling load.6 Devices also can provide for individual control over the indoor
environment resulting in higher occupant satisfaction. Table 5-5 and Table 5-7 in
Chapter 5, "Lighting Equipment" describes space types, control strategies which may be
most appropriate, and potential energy savings. ASHRAE/IESNA 90.1-1999 lighting
control requirements must be met at a minimum. A summary of these control
requirements is listed below. Refer to ASHRAE/IESNA 90.1 -1999 for specific control
implementation and exceptions.
Lighting control requirements for ASHRAE/IESNA 90.1-1999:
Automatic Lighting Shutoff (126.96.36.199.) Interior lighting in buildings larger
than 5000 ft must be controlled with an automatic control device to shut
off building lighting in all spaces.
Space Control (188.8.131.52.) Each space enclosed by ceiling-height partitions
must have at least one control device to independently control the general
lighting within the space. Each control device must be activated either
manually by an occupant or automatically by sensing an occupant.
Exterior Lighting Control (184.108.40.206.) Lighting for all exterior applications not
exempted in 9.1 and 9.3.2 must be controlled by a photosensor or
astronomical time switch that is capable of automatically turning off the
exterior lighting when sufficient daylight is available or the lighting is not
If daylighting is used, electric lighting must be integrated with daylight
controls to realize energy savings potential. Refer to Chapter 3,
"Sustainability", Chapter 4, "Daylighting" and Chapter 5, "Lighting
Ballast selection must match control strategies. Instant start ballasts must
not be used in areas where lighting is controlled with occupancy sensors.
Refer to Chapter 5, "Lighting Equipment Ballasts and Power Supplies",
for ballast selection and control compatibility.
Lighting zones allow for optimal control of the overall lighting system. A
lighting zone refers to a group of luminaires that are controlled together. Many portions
of the lighting system can be controlled separately including ambient, task, accent, and
display lighting. When controlling electric light in response to daylight, zones can be
arranged according to the luminaires proximity to windows or skylight. For example,
rows of luminaires closest to a window wall should be controlled separately from the
interior rows. Occupancy sensors may control a zone of luminaires over a group of
workstations in an office.
"Energy Management", Lighting Handbook Reference and Application, Chapter 26, Ninth Edition (New
York: The Illuminating Engineering Society of North America, 2000), p. 26-1.