Exam 14: Lighting

What unit of measurement is used to measure the amount of illumination on a surface?

What is the approximate percentage of light reflected by a black colored surface?

When considering multiple light sources, the amount of illumination at a given point is the sum of the light rays coming from all the units.

A glow switch is also called a(n) ____.

A luminaire is  _____.

The ratio between the light that reaches the working plane and the light produced by the luminaire provides a constant known as the ____ .

A light intensity curve can be used to show that the amount of illumination is independent of the angle from the source.

Which law is used to calculate the intensity of light at a given distance from a source?

One type of luminaire is indirect.

When lighting is so bright that it causes eye discomfort, it is said to produce ____.

Candlepower and lumens are units of measurement of light emitted from a source.

The most common type of electric discharge lamp is the ____ lamp.

____ lighting fixtures transmit 60 percent to 90 percent of the light upward.

A(n) ____, highly polished, bright material reflects most of the light that strikes it.

Mirrored glass reflects 99 percent of the light that strikes it.