INT 222 Exam 3 - 20 Question Review

What do we call the reflected glare resulting from a light source reflecting in a surface?

Veiling Reflection

What is the subjective perception of light level?

Brightness

What is the name for the ratio of lumens to watts produced by a light source?

Efficacy

Light source output is measured in what?

Lumens

A 4100 K lamp is considered as what type of source?

Cool Source

Object colors are what?

selective reflections of colored light

Gas discharge lamps do not include what?

Tungsten Halogen

What type of lamps last longer than traditional incandescent sources?

Tungsten Halogen Lamps

High Pressure Sodium lamps produce what?

red-orange light

Strong brightness contrast in which highlighted objects stand out from a low brightness background creates a sense of what?

drama

Light Emitting Diodes (LEDs) are made of what?

semiconductor material

What are the two metrics commonly used to measure the quality of white light?

correlated color temperature (CCT) and Color Rendering Index (CRI)

Secondary optical systems can consist of what?

light shaping films, reflectors, and lenses

What does the acronym PAR lamps stand for?

Parabolic Aluminum Reflector

One lamp type specifically designed to replace incandescent lamps is what?

compact fluorescent

True or False: Lighter wall finishes will reduce light output, while lowering surface brightness

False

True or False: currently fluorescent lighting is the principal source of lighting for commercial and industrial interior lighting.

False

True or False: Recessed fluorescent luminaires are often referred as troffers.

True

True or False: Low Kelvin appear “warm”

True

What does IESNA stand for?

Illuminating Engineering Society of North America