At the end of this chapter you should be able to:
State that light is emitted by hot tungsten wire in an
lamp and an
in a gas.
Compare efficiencies and colour
Define flux, intensity,
the illuminance of
surface using E = I cos θ/d
Calculate the number of luminaires needed to provide uniform
lighting using the lumen method together with maintenance and
the effects of diffusing and prismatic
State the conditions
affect the amount of
point in a room.
White light may be resolved into a band of colours called the spec-
trum ranging through red, yellow, green, blue and violet by passing