F: Factors to consider in selection of light source

Question 1

the initial rated light power output

Answer 1

Initial Lumens

Question 2

The average of the initial lumens output at the end of
the rated life of the lamp.

Answer 2

Average Lumens

Question 3

the lumens output at 40% of the rated life of the lamp.

Answer 3

Mean Lumens

Question 4

The initial lumens output within the central beam

Answer 4

Beam Lumens

Question 5

Light intensity is expressed in candelas at various angles from the lamp or fixture.

Answer 5

Intensity

Question 6

is defined as the light output per unit of
electrical power (watts) input or lumen watt (lm/w).

Answer 6

Luminous Efficacy

Question 7

A measure of the total light power output in lumens versus
the total light power input of all lamps in the luminaire.

Answer 7

Luminaire Efficacy

Question 8

The time elapsed when 50% of a group of lamps remain burning

Answer 8

Rated Lamp Life

Question 9

The loss of light, light output depreciates with time.

Answer 9

Lumen Depreciation

Question 10

Physically, small light sources of high intensity such as incandescent lamp are excellent for light control but can be too bright for visual comfort.

Answer 10

Brightness