Interior Lighting Applications

Question 1

accent lighting

Answer 1

Directional lighting to emphasize a particular object or surface feature, or to draw attention to a part of the field of view.

Question 2

acceptance half-angle

Answer 2

The acceptance half-angle is set by the refractive indices of the core and cladding of fiber optics. It is expressed in terms of the numerical aperture (NA).The numerical aperture is given as:

NA = n0*sinθmax
​
where:

θmax is the greatest angle from the optical axis of a circular fiber where the external meridional plane ray will undergo total internal reflection within the fiber

n0 is the refractive index of the medium outside the fiber (for air, n0 = 1)

Question 3

ace

Answer 3

In television, film and theater lighting: A 1000-W Fresnel spotlight.

Question 4

air mass (optical air mass)

Answer 4

The ratio of the path length of solar radiation through the atmosphere to a given point, relative to the path length from sea level to the zenith.

Question 5

altitude angle

Answer 5

The angular distance of a heavenly body measured from the horizon toward the zenith.

Question 6

ambient lighting

Answer 6

Lighting throughout an area that produces general illumination.

Question 7

analog multiplex, AMX

Answer 7

An industry standard control protocol for the transmission of dimming level or other data using an analog multiplexer.

Question 8

annual sunlight exposure (ASE)

Answer 8

In daylighting: The fraction or percentage of the horizontal work plane that exceeds a specified direct sunlight illuminance level more than a specified number of hours per year over a specified daily schedule with all operable shading devices retracted.

Question 9

arc

Answer 9

In television, film and theater lighting: A discharge light source, usually a carbon arc.

Question 10

area lighting (television, film, theater)

Answer 10

The practice of lighting the acting space in separately controlled areas.

Question 11

asbestos tapoff

Answer 11

see twofer - In television, film and theater lighting: A load connector wired in parallel to two line connectors so that two luminaires can be connected to a single electrical circuit.

Question 12

automated fixture

Answer 12

In television, film and theater lighting: A lighting fixture whose color, movement, speed, beam size, beam pattern, or other attributes are controlled remotely from a control console.

Question 13

azimuth

Answer 13

The angular distance between the vertical plane through a direction to a distant object or sky position, or the facing direction of a building façade, and a reference direction (typically North or South). (See also solar azimuth.)

Question 14

baby

Answer 14

In television, film and theater lighting: Once a 250-watt to 300-watt planoconvex spotlight, with lens diameter of 10 to 13 cm (4 to 5 in.). Now usually a 500W- to 1000-W Fresnel spotlight with a lens diameter of 15 cm (6 in.), standard in the motion picture industry.

Question 15

back light

Answer 15

In television, film and theater lighting: Illumination from behind (and usually above) a subject to produce a highlight along its edge and consequent separation between the subject and its background. Syn.: fringe light, halo light, contour light, hair light.

Question 16

backing lighting

Answer 16

In television, film and theater lighting: The illumination provided for scenery in off-stage areas visible to the audience.

Question 17

baffle

Answer 17

A single opaque or translucent element to shield a source from direct view at certain angles, to absorb or block unwanted light, or to reflect and redirect light.

Question 18

balcony lights

Answer 18

In television, film and theater lighting: Luminaires mounted on the front edge of the auditorium balcony. Syn.: rail lights, FOH spots (see front of house (FOH) spots).