6.8 Interior Lighting,
Specific lighting design issues associated with individual
space types are discussed later in this chapter in the
Daylighting, and Control
subsection titled Specific Lighting Constraints.
Qualifications of the Lighting Practitioner. Lighting
Systems
design shall be performed or supervised by a practitioner
credentialed as Lighting Certified (LC) by the National
Council on Qualifications for the Lighting Professions
The lighting and daylighting systems of a building
(NCQLP). Visit www.ncqlp.org for more information.
represent one of the most critical components to the
architectural aesthetic, the successful completion of tasks,
and the annual energy consumption of the building. In
for typical interior spaces are indicated in Table 6-3. These
order to effectively address all these concerns, the lighting
ranges of illumination require the average illumination
systems must be sensitive to the interior and architectural
at the task (workplane) to be greater than the minimum
design while providing an adequate quality and quantity
value and less than the maximum value. For those areas
of illumination throughout the building. Yet, the lighting
not listed in the table, the IES Lighting Handbook may
system must maintain an energy efficient design that,
be used as a guide. The design illumination levels shall be
at minimum, meets ASHRAE/IES 90.1 lighting power
confirmed by computer simulation for each of the typical
density requirements. In addition, the lighting design
space types throughout the building.
shall attempt to minimize maintenance requirements.
Visual Comfort. The lighting system must be designed to
General Lighting Design Criteria
reduce glare, minimize contrast ratios, and provide proper
color rendering as recommended in the latest issue of the
The electric lighting design criteria are intended to ensure
Illuminating Engineering Society of North America (IES)
sufficient visual comfort and performance of the lighting
Lighting Handbook.
environment provided by the electric lighting systems.
Lighting designs must minimize harsh contrasts by
Energy Efficient Design. At a minimum, lighting design
employing a combination of direct and indirect lighting
must comply with the current version of ASHRAE/IES
sources. This can be accomplished through the use of
Standard 90.1 maximum lighting power densities. Table
indirect/direct lighting systems, wall sconces or a
6-3 lists the requirements for typical interior spaces; the
combination of uplighting and downlighting. In addition,
Standard shall be consulted for other space types. Task
vertical surface illumination shall be considered, where
lighting is included in the maximum LPDs provided by
applicable.
the Standard.
Task/ambient lighting strategies are designs that break
Accessibility for Servicing. Careful consideration must
down the lighting system by the lighting purpose. Lower
be taken in the design of lighting systems regarding
levels of even, ambient illumination are provided
servicing of the fixtures and replacement of lamps. This
throughout the space with local task lights providing
issue needs to be discussed with building operation staff
greater illuminance at the task.
to determine the dimensional limits of servicing equipment.
189
ELECTRICAL
ENGINEERING
6.8
Interior Lighting, Daylighting, and Control Systems
Revised March 2005 PBS-P100
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