LIGHTING TERMS

Question 1

• lamp invested by a Swiss named Argand in 1783

- had a round wick with provision for the intro. of air inside the wick as well as around the outside

Answer 1

Argand Lamp

Question 2

• oil lamp with swinging the tubular arms, generally furnished with an a Argand burner
• used in the early 19th century

Answer 2

Astral Lamp

Question 3

-the process by which the eye adjusts to a change in light level

Answer 3

Adaptation

Question 4

-general light, often indirect, or entering a room from an adjacent space

Answer 4

Ambient Light

Question 5

-an opaque or translucent element used to shield a lamp from view or to absorb unwanted light

Answer 5

Baffle

Question 6

-a device used with HID and fluorescent lamps to establish the circuit conditions necessary to start and operate the lamp

Answer 6

Ballast

Question 7

-an unshielded light source

Answer 7

Bare Lamp

Question 8

-glare so intense that cannot se for a short period of time

Answer 8

Blinding Glare

Question 9

• any artificial light source, concealed behind a decorative facing, which allows the light to diffuse over its edges, and through it, if the facing is translucent be recessed into ceiling or wall can be direct, indirect, or semi-direct
• cove and valance lighting are examples

Answer 9

Concealed Light

Question 10

-the difference in luminance between an object and its background

Answer 10

Contrast

Question 11

-an optical filter that selectively reflects some wavelengths, while transmitting others

Answer 11

Dichroic Mirror

Question 12

-one that appears scattered, either in reflection or transmission

Answer 12

Diffuse Reflector

Question 13

-a device used to regulate the intensity of light from a lamp

Answer 13

Dimmer

Question 14

-this is light that is focused and forced to travel in a particular direction either by a reflector or baffle

Answer 14

Directional Light

Question 15

-glare the reduces visibility and visual performance

Answer 15

Disabling Glare

Question 16

-annoying glare but often does not reduces visibility and visual performance

Answer 16

Discomfort Glare

Question 17

-recessed or semi-recessed lighting unit with a rotating spherical element that may be turned to project light in any direction below the ceiling line

Answer 17

Eyeball

Question 18

-a way of transmitting light through long flexible glass or plastic fibers, using the principle of total intern refraction

Answer 18

Fiber Optics

Question 19

-a device to change, in transmission, the quality of light affecting the magnitude and or spectral make-up

Answer 19

Filter

Question 20

-the emission of light, only during the absorption of radiation of a different wavelength

Answer 20

Fluorescence

Question 21

-the density of a light on a surface

Answer 21

Illuminance

Question 22

-a lighting unit which, by means of lenses and mirrors, concentrates light in a limited angle and intensifies it

Answer 22

Projector

Question 23

-a general term used to describe devices that block, diffuse or redirect light such as a louver or lampshade

Answer 23

Shielding

Question 24

-a term applied to any stray light outside the main concentration of the beam, usually controlled by louvers, baffles. etc.

Answer 24

Spill Light

Question 25

-glare,, where reflection reduces contrast and so prevents detail being discerned

Answer 25

Veiling Reflection

Question 26

-usually the horizontal surface at which a task is performed and at which light levels are specified and measured

Answer 26

Work Plane