Terms listed in this glossary are identified in context throughout the courses within this site. You can identify glossary terms links by this icon:

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LEED — Leadership in Energy and Environmental Design

LEED–NC 2.2 rating system - The Leadership in Energy and Environmental Design ( LEED)Green Building Rating System is a suite of standards for environmentally sustainable construction developed by the U.S. Green Building Council. Buildings pursuing LEED certification can qualify for one of four levels of certification: certified, silver, gold or platinum (dependant upon the number of credits achieved). The rating system addresses six major areas:

• Sustainable sites
• Water efficiency
• Energy and atmosphere
• Materials and resources
• Indoor environmental quality
• Innovation and design process

Light Shelf — A horizontal shelf positioned (usually above eye level) so as to reflect daylight onto the ceiling.

Louver — A series of baffles designed to shield a source of light from direct view (or to absorb light) at certain angles.

“Low-e” coatings – A low-emittance coating is a microscopically thin, virtually invisible, metal or metallic oxide layer on a window or skylight glazing surface for the purpose of reducing radiative heat flow.

Lumen hour (lm-hr )- A unit of quantity of light (luminous energy), equal to the quantity of light radiated or received for a period of 1 hour by a flux of 1 lumen.

Luminaire — A light fixture consisting of the housing, lamp, ballast (if any) and any other optical components.