Code: Sec 30 Lighting

Question 1

How is the colour of light related to temperature?

Answer 1

The hotter an object is, the shorter the wavelength of radiation. Specific temperatures are associated with certain wavelengths.

Question 2

Unit describes the brightness of a light source?

Answer 2

Candela

Question 3

Total quantity of light emitted in one second by one candela light source is?

Answer 3

1 LUMEN of light

Question 4

Range of electromagnetic wavelengths making up visible lights?

Answer 4

400-700 nm (nano meters)

Question 5

Electric discharge lighting

Answer 5

Fluorescent lamps and high intensity discharge (HID). These operate by establishing and maintaining a current flow through vapour, then emits electromagnetic radiation

Question 6

Lampholder

Answer 6

Part of a luminaire that physically holds a lamp in place and connects to its electrical source

Question 7

Ballast

Answer 7

To produce light in electrical discharge luminaire.

Electromagnetic: composed of electromagnetic coils

Electronic ballasts: composed of solid state components.

Question 8

Luminaire canopy

Answer 8

Removable cover that covers the outlet box where the conductors connect to the branch circuit supply wires

Question 9

What is the formula for efficacy?

Answer 9

Power output (lumens) by power input (watts)

Power over watts