Lighting

Question 1

What are the four factors that govern visibility?

Answer 1

Size, contrast, brightness, and time

Question 2

The ________ and ________ of light can improve the performance of difficult visual tasks

Answer 2

Quantity, and quality

Question 3

Light is a special form of ________ which produces the sensation of sight

Answer 3

Electromagnetic radiation

Question 4

The wavelength of visible light ranges from approximately ________ to ________

Answer 4

380 to 760 nanometers

Question 5

By passing a beam of white light through a prism, the beam will spread and separate into individual
visible wavelengths known as a ________

Answer 5

Colour spectrum

Question 6

The quantity of light output from a source is called ________

Answer 6

Luminous flux (Lumen (Lm))

Question 7

The density of light flux measured on a surface is known as ________

Answer 7

Luminous flux density (Lux (Lx))

Question 8

________ is a ratio of the light output (lumens) compared to the power input (watts) for a light source

Answer 8

Efficacy

Question 9

An adequate quantity of light does not always provide good illumination. Name the 3 additional factors

Answer 9

Glare, diffusion, and colour

Question 10

________ is a level of brightness that causes interference with vision that typically causes discomfort or eye fatigue

Answer 10

Glare

Question 11

________ is the effect of scattering the light into many different directions

Answer 11

Diffusion

Question 12

________ is an important factor for applications that involve color matching or color discrimination, as
well as certain inspection tasks

Answer 12

Light source colour