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L
LOUVER
A series of baffles used to shield a source from view at certain angles, to absorb or block unwanted light, or to reflect or redirect light. The baffles are usually arranged in a geometric pattern.
LOW SMOKE
Smoke that has been chilled as soon as it comes out of the smoke machine. This causes the smoke to lay close to the floor. Use fast dispersing smoke for this effect because when the smoke heats up in the air, it will rise.
Low Smoke is much safer to work with than DRY ICE, which produces a longer-lasting effect but is more expensive.
LOW VOLTAGE
- Lower voltage lamps give more intense light than mains voltage lamps of the same wattage.
- A lamp that nominally operates at 6, 12, or 24 volts. A transformer must be used to convert the 120-volt line voltage to the lower voltage.
LUMEN / LUMENS
- Measurement of brightness of light source.
- A measure of light output from a source. The brightness of video projectors is stated in Lumens.
- A unit used to measure the brightness of a light source. The more lumens produced per watt of power supplied, the more efficient a light source is.
LUMEN DEPRECIATION
The decrease in lumen output that occurs as a lamp is operated, until failure.
LUMINAIR
- The international term for lighting equipment. Not restricted to theater lighting.
- A lighting instrument. A common term in the UK, luminair is finding more common usage in the United States.
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