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B&H glossary for Professional Video,
   

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Glossary for Lighting Terms
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N

Nanometer (nm)
A unit of measurement commonly used for wavelengths of light, equal to 1/1,000,000,000 meters.

Neutral Density Filter
A filter that reduces the intensity of light without affecting its color.

NFL
A lamp designation that means “narrow flood”.

Noise
An abridged version of Electrical Noise.

Non-Dim

  1. A term used to describe a circuit that does not pass through a dimmer.
  2. A term used to describe a load that is not intended to be connected to a dimmer.

NSP
A lamp designation that means “narrow spot”.

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