UFC 3 -520-01
June 10, 2002
Lighting design is one of the fastest changing areas of interior electrical
design. Because of the many recent a dvances in lighting technology, including the
industry's understanding of lighting needs for optimal human performance, this
appendix has been developed as a stand -alone document for lighting requirements.
Lighting systems are not static devices a nd require maintenance over time to
maintain light levels at acceptable minimums. A key objective is to predict how much
extra light is needed to account for non-recoverable losses over the life of the system
and recoverable losses between maintenance cyc les. Another important objective is to
understand how light will be distributed across various tasks and adjacent surfaces.
These are some of the reasons why lighting concepts often require mathematical
modeling to predict their validity.
Good lighting begins with concepts that meet specific needs. Specific needs
for lighting will be different depending on the relative importance of appearance, task,
safety, security, maintenance, and energy issues. Although energy is important, the
quality or p urpose of the lighting design should not be a compromise for the purpose of
pure energy savings. If retrofitting an existing project to reduce energy consumption,
verify that the lighting design requirements will still be met.
Currently, electric lighting is responsible for about 25 percent of the electrical
energy use in North America. By using sound lighting design practices and new
equipment technologies, there are significant opportunities for additional power
conservation. This appendix has b een developed to ensure compliance with the Energy
Policy Act of 1992 and Executive Order (EO) 13123, Greening the Government Through
Efficient Energy Management, which regulate or restrict lighting applications and their
energy use in both new and existing Federal buildings.
Federal policy requires the use of life cycle costing to properly evaluate the
true cost of lighting. In many instances, lower first costs do not reflect the most cost-
effective long -term solutions. Specific requirements of this manual, such as the use of
T-8 fluorescent lamps, are considered de facto compliant with applicable efficiency and
cost effectiveness provisions of Federal law and serves as the minimum standard for
There is no substitute for practical experience in lighting design. In many
ways, lighting design is an art and in others ways it is a science. Some lighting
solutions are simple because they are easy to define based on previous experience.
Complex spaces with complex needs wi ll require the assistance of a Certified Lighting