5.4.2 Lighting controls
Lighting systems should be provided with lighting controls to enable switching
off after business hours. The lighting circuit should be designed with multiple
independent light control zones to enable partial switching off.
Automatic on/off systems are recommended to prevent lights from being left on
without someone in attendance. The automatic on/off controls can be designed
according to the occupancy schedule.
Lighting control devices should also be used in the areas where daylight
is available. Either dimming or switching controls with appropriate circuit
arrangements can be effective in maintaining suitable interior illumination levels.
should be strategically located to reduce the artificial lighting level and
hence energy consumption.
The lighting system should be designed to provide reduced light levels during
cleaning periods, with a proper means of switching on and off being provided for
the cleaning staff. All spaces that are not used continuously should have local or
automatic switching, allowing lights to be turned off when the space is not in use.
Figure 112 Photocell
5
Energy efficient building systems for shopping malls and shop spaces
5.4
Electricity and lighting
High efficacy
fluorescent/compact
fluorescent tube
• This could be used for arcades, plant rooms, staircases,
corridors, toilets and carparks.
• 70 – 80% energy saving can be achieved compared with
incandescent lamp.
• T5 fluorescent lamp with electronic ballast is
recommended due to high luminous efficacy.
• It could be used for arcades, plant rooms, staircases,
corridors, toilets and carparks.
• 30 – 40% energy saving can be achieved compared with
the T8 fluorescent lamp.
T5 fluorescent lamp
• This has lower
than conventional
ballast; a traditional switch start T8 tubular fluorescent
lamp should not be used.
• 20 – 40% energy saving can be achieved compared with
conventional electromagnetic ballast.
Modern electronic
ballast
• Self-luminous EXIT sign complying with BS5499:
Part 2 should replace traditional EXIT signs illuminated
by fluorescent light fitting/incandescent lamp.
• 100% energy will be saved as no power is required.
Self-luminous exit sign
Hong Kong Green Building Council 135
