Light Properties

Question 1

Candela ?

Answer 1

Luminous intensity =
Luminous emitted by unit solid

Question 2

Lumens

Answer 2

Rate of luminous flux / unit of time

Question 3

Lux

Answer 3

Lumen /sq. Meter
Illumination

Question 4

Lambert

Answer 4

Luminescence
Quantitive measure of brightness that a surface emits.

Question 5

Brightness

Answer 5

Capacity of observer to differences in differences in luminescence

Question 6

Visual acuity increases with ?

Answer 6

Object brightness

Question 7

Visual acuity increases with?

Answer 7

Object brightness

Question 8

To distinguish what is being viewed from its background, to discern shape and form

Answer 8

-contrast, differing levels of luminescence
-shape and contour more discernable

Question 9

Glare

Answer 9

-luminescence more than human eye can handle.
-direct glare : source too bright (use lamp shades )
-reflected off surface = indirect glare

Question 10

Temperature of daylight, sky, HPS

Answer 10

5000, 10000, 1000

Question 11

Illumination level for surgery

Answer 11

4000 lux

Question 12

Illumination level for dinner

Answer 12

215 lux

Question 13

Illumination level for reading

Answer 13

538

Question 14

Water pressure in public pipes ?

Answer 14

345 kpa