Deck 10: Lighting

Question 1

When 900 lumen falls onto a 2.0 m² surface from a fluorescent lamp, and a light meter finds that 360 lumen are reflected, the luminance of the surface is:

A)3
B)0.71
C)0.4
D)0.2
E)1.25

Answer 1

C

Question 2

Light falling onto the surface in a room:

A)Some is absorbed and some reflected
B)Is all absorbed
C)Is all reflected
D)Bounces off at same angle as it arrives
E)Displays the colour of the surface material

Answer 2

A

Question 3

Illumination Intensity is which?

A)Lumens
B)Light level
C)Illuminance
D)Lumen/m²
E)Lumen per watt

Answer 3

C

Question 4

Efficacy of a lamp means?

A)Lumens light output per watt of electrical input power to lamp
B)Efficiency at converting colour temperature into illuminance on the working plane
C)Percentage of lamp globe or tube surface area that emits light
D)Proportion of lamp light output directed toward the working plane
E)Luminous efficacy is total illuminance produced divided by lamp electrical input power including all control equipment consumption

Question 5

Light system glare means?

A)Florescent indoor lighting systems do not cause glare
B)Whether discomfort is created in a particular viewing direction
C)Sedentary position includes direct view of sunshine
D)Impairment of vision due to excessive brightness
E)All lighting causes glare when viewed directly

Question 6

What is an air-handling luminaire?

A)Sealed luminaire to keep out moisture
B)A sealed light fitting inside an air handling unit to allow servicing work
C)A light fitting open to the room air allowing cooling
D)Lamp designed for low temperature operation
E)Luminaire passing air returning to the ductwork system from the conditioned room

Question 7

What is meant by lamp colour temperature?

A)Colour shift in surface caused by the type of lamp
B)Description of colour-rendering property
C)Colour of the lamp when viewed directly
D)Infra-red fraction of the sun produced by the lamp
E)Calculated average temperature from each of eight wavelength bands in the light produced by a lamp

Question 8

Which are correct descriptions of lighting system sensor operation?

A)People in office workstations cannot be seen by infra-red, microwave and acoustic sensors
B)Frequent switching of fluorescent lighting does not work
C)Correctly placed occupancy sensors ensures safe access at all times and fluorescent lamps switch on very quickly
D)Fluorescent lamps take too long to switch on for automatic sensing systems to work efficiently and people have to walk into a dark room
E)Unoccupied rooms should not remain without lighting as they are an invitation to burglars

Question 9

Which is correct about lighting?

A)1000 lumen/m² is a very bright indoor illumination level
B)1000 lux is a very dull indoor illumination
C)A typical fluorescent tube emits about one million lumens
D)Fluorescent lighting does not cast shadows
E)LED lighting is very energy-inefficient

Question 10

Which of these correctly describe BZ classification?

A)BZ 5 projects only sideways and is used for wall mounted luminaires
B)BZ 0 means equal spherical illuminance
C)BZ 10 means light projection all downwards
D)BZ 10 has a luminaire directing all light output upwards providing only reflection off the ceiling
E)BZ defines the solid angle projection from a lamp in streradians