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BEAM P
LUS FOR
N
EW
B
UILDINGS
I
NDOOR
E
NVIRONMENTAL
Q
UALITY
(I
EQ
)
V
ERSION
1.2
I
EQ
16
I
NTERIOR
L
IGHTING IN
N
ORMALLY
O
CCUPIED
A
REAS
Copyright © 2012 BEAM Society Limited. All rights reserved.
Page 177
B
ACKGROUND
Energy efficiency aspects of electric lighting are dealt with in the
assessment of energy use. This section deals with the lighting quality
and maintenance aspects of lighting. Lighting quality is a complicated
subject and is an integration of task performance, visual comfort, social
communication, mood, health, safety and well-being and aesthetic
judgment. It is also related to economics and the environment in respect
of the installation, maintenance and operation of the lighting system.
Proper lighting maintenance (clean lamps and luminaires, lamps
replaced periodically to avoid depreciation) is important to maintain good
lighting quality throughout the whole life of the lighting installation.
Besides the energy conservation, power quality and control benefits
offered by dimmable high-frequency electronic ballasts, the high
frequency modulation avoids the problem of ‘flicker’ that can occur when
using mains frequency ballasts.