B&H glossary for Professional Video,
   

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Glossary for Lighting Terms
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G

Gaffer
A term used by professional film and video industry lighting people to refer to someone overseeing those operating or utilizing luminaries and related equipment, such as electric cables, dimmers, etc.

Gaffer Grip
A large, spring-loaded clamp with serrated or rubber cushioned jaws. It usually has a stud or studs for the attachment of luminaries and grip equipment.

Gaffer’s Pole
See the definition of Operating Pole.

Gag
An apparatus that comprises two gripheads attached to each other via a common bolt.

Gel (Gelatin, Media)
As used with photographic lights, a strong, flexible, fade-resistant material, used to change the color, amount or quality of light.
Tip:
Blues fade fairly fast.

Guide Number
Guide numbers proclaim the power of strobes. Closest equivalent for Hot-lights, Footcandles, Lux or our f-stop approximations.

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