WorksheetsLighting 1
Total questions: 20
Worksheet time: 10mins
In Lighting terms what is the unit measure of luminous intensity?
Lux
Candela
Luminous flux
illuminance
Which of the following is an outcome of the stroboscopic effect
Objects appear to be moving faster than they really are.
Objects may appear to be standing still
The stroboscopic effect can be used to measure the speed of objects
Objects may appear to be a different colour than what the really are
The amount of lux on a surface 1 metre directly below a 1000 lumen light source is .....
250 lux
500 lux
750 lux
1000 lux
A lamp will emit light in all directions and we can calculate the lux level at any angle away from the point directly below the lamp. The formula we use is:
E=(I/d²) /Cos Ø
E=(I x d²) /Cos Ø
E=(I/d²) x Cos Ø
E=(I/d) x Cos Ø
Light levels are generally set by the needs of the visual task. What is not considered a influencing factor in this regard?
cost of the lighting type selected
details of task
reflectance and contrast (task and backgorund)
the eye (age and condition)
As per AS/NZS 1680 moderately difficult tasks require a Lux level of how much?
240 lux
320 - 400 lux
600 lux
800 lux
90 - 100 pecent of the light is directed downward refers to what type of lighting classification
Direct lighting
Indirect lighting
Semi-direct
Semi-indirect
Light which is scattered by a translucent median and which is thus reflected or scattered in different directions refers to what type of lighting
Semi-direct lighting
Semi-indirect lighting
Diffused lighting
Indirect lighting
Light is a form of ______________ energy which travels in waves
electromagnetic
static
infrared
Ultraviolet
The wavelength of light energy is measured in what unit
millimetres
micrometres
picometres
nanometres
The fillament of of a standard incandescent lamp is made of what material
Krypton
Nickle
Tungsten
Plated copper
The service life of a incandesent lamp is approximately how many hours
2000 - 3000 hours
5000 hours
1000 - 2000 hours
500 - 1000 hours
The luminous efficacy of a incandescent lamp is how much?
8 - 10 lm/w
20 - 25 lm/w
40 - 60 lm/w
90 - 100 lm/w
Modern tungsten halogen lamps have a service life of between how many hours
500 - 1000 hours
3000 - 5000 hours
6000 - 15000 hours
20000 - 30000 hours
For a given light output a Tungsten Halogen lamp uses between 1/5th and 1/4 the power of an equivalent incandescent lamp. This means the efficacy of a tungsten halogen lamp is approximately ______
12 lm/w
25 lm/w
40 lm/w
60 lm/w
When halogen light fittings are installed in the ceiling clearances to building elements must be maintained. The minimum clearances for a tungsten halogen light fitting is
200mm
150mm
100mm
50mm
LED lights are extremely energy efficient and consume up to __% less energy than a incandescent light for the same light output.
25
50
75
90
The semiconductor material used in LED's will determine the overall wavelength of the photon light emissions and therfore the resulting colour of the light emitted.
True
False
The following description refers to what type of lighting device? " When the bimetal closes it extinguishes the glow so the bimetal is no longer being heated and when as the bimetal cools the contacts open"
Fluroescent wire wound ballast
Fluroescent tube
Fluroescent electronic ballast
Fluroescent glow starter tube
The stroboscopic effect of fluroescent lights is primarilly caused by what?
Glow starter tubes
Electronic ballasts
The power factor capacitor
Wire wound ballasts
