AMBIENT LIGHT - The existing light before any supplementary light is added.

AMP - (Ampere, A) The unit of electrical current. Small (1 kW) lights use nearly 5 amps. Larger (3 kW) lights use 15 amps.

APERTURE - The variable-sized opening in a lens that controls the amount of light passing through the lens. Large apertures have small f-numbers, small apertures have large f-numbers.

ARTIFICIAL LIGHT - Light that is produced by any source other than sunlight.

AVAILABLE LIGHT - Existing light that is deemed suitable to produce reasonable quality pictures.

BACK LIGHT - Light from behind a subject creating a bright rim to help separation from a background.

BARN DOOR - Two- or four-bladed, hinged shutters fitted to a luminaire to shape the ...

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