Tungsten halogen lamp - improved version of the normal tungsten lamp. It is much smaller and more consistent in color temperature as the glass envelope used is non-blackening.
Tungsten or tungsten halogen lamps designed for studio use. Have a longer life than photo lamps, but a lower specific output and colour temperature. Are used with type B films.
SQF
Subjective Quality Factor. Essentially a lens rating system.
Tungsten light
Artificial light from either tungsten filament or tungsten halogen lamps.
(see Blonde, Redhead & Tungsten film)
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Incandescent Lamp or Light
A lamp that produces White Light when electric current excites the filament. See: Tungsten Filament and Tungsten Halogen Lamp.
 See also: Focal length, Lenses, Negative, Tone, Shutter speed
  
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