Lighting 1

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