Glossary
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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