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2. Troffer - Wikipedia

   en.wikipedia.org/wiki/Troffer

   Troffer fixtures have typically been designed to accommodate standard fluorescent lamps (T12, T8, or T5), but are now often designed with integral LED sources. Troffers are typically recessed sitting above the ceiling grid, but are also available in surface mount 'boxes'. Those with integral LEDs are often known instead as LED light panels.

3. Volumetric lighting - Wikipedia

   en.wikipedia.org/wiki/Volumetric_lighting

   In volumetric lighting, the light cone emitted by a light source is modeled as a transparent object and considered as a container of a "volume". As a result, light has the capability to give the effect of passing through an actual three-dimensional aerosol (e.g. fog, dust, smoke, or steam) that is inside its volume, just like in the real world.

4. Lighting - Wikipedia

   en.wikipedia.org/wiki/Lighting

   However indirect lighting is completely reliant upon the reflectance value of the surface. While indirect lighting can create a diffused and shadow free light effect it can be regarded as an uneconomical lighting principle. [12] [13] Front lighting is also quite common, but tends to make the subject look flat as its casts almost no visible shadows.

5. Stage lighting - Wikipedia

   en.wikipedia.org/wiki/Stage_lighting

   Composition: Lighting may be used to show only the areas of the stage which the designer wants the audience to see, and to "paint a picture". [4] [5] Effect: In pop and rock concerts or DJ shows or raves, colored lights and lasers may be used as a visual effect. Lighting design is an art form, and thus no one way is the "correct" way.

6. Covering space - Wikipedia

   en.wikipedia.org/wiki/Covering_space

   For every topological space , the identity map: is a covering. Likewise for any discrete space the projection : taking (,) is a covering. Coverings of this type are called trivial coverings; if has finitely many (say ) elements, the covering is called the trivial -sheeted covering of .

7. American Garage - Wikipedia

   en.wikipedia.org/wiki/American_Garage

   American Garage is the second studio album by the Pat Metheny Group, recorded in June 1979 and released on ECM in November 1979. The quartet features rhythm section Lyle Mays , Mark Egan and Dan Gottlieb .