LED Light Panel
Motion Sensor
Task Light for
individual station
Office
UNIT
Conventional
General Illumination
Ambient lighting
General Illumination
+
Task Lighting
Figure 3.3.13 Illustration
on Task Lighting
Figure 3.3.14 Nano luminaire
(Source: Hong Kong Green Building Council)
Figure 3.3.15 Position of photo sensor
(Source: Hysan Development Company Limited)
To achieve the objectives of
energy savings and improved
illumination, existing T8
tubes were replaced with
more energy efficient LED
tubes.
Figure 3.3.16 LED tubes
(Source: Hong Kong Green Building Council)
Figure 3.3.17 Hong Kong Green Building Council office entrance
(Source: Hong Kong Green Building Council)
Figure 3.3.18 Lighting Reflectance
(Source: Hong Kong Green Building Council)
For some lighting fittings,
reflectors with high
reflectance (95%) are
used in order to maximise
the energy efficiency and
enhance light distribution.
Office
UNIT
Figure 3.3.19 Photo Sensor Figure 3.3.20 LED lighting
panels in Jones Lang LaSalle
Office
Photo Sensors on
Office Floors:
Dim the light in
perimeter zones under
the right daylight
conditions and reduce
energy consumption.
Figure 3.3.21 LED lighting panels
(Source: Business Environment Council)
Figure 3.3.22 LED lighting panels
at Business Environment Council
(Source: Business Environment Council)
DESIGN STAGE
3.3.3 Energy Saving Technology
Case study
of Business
Environment
Council Office
LED Lighting Panels
Replacement of T8 fluorescent
tubes with LED lighting panels.
Payback Period of LED Panels
(Full Cost): 5.5 Years.
Case study of Hong
Kong Green Building
Council:
Case study of
International Commerce
Centre
• Reduce Lighting number-> 39 number
• Reduce Lux Level : 500 Lux-> 300 Lux
• Approximately 14% overall annual energy
saving includes 39% saving on lighting annually
Business
Environment
Council Office
No. of
Luminaire
Unit Power
per Luminaire
(W)
Annual Power
Consumption
(kw/h)
T8 Florescent
Tube
148
60
23,088
LED Panel
102
40
10,608
Change
46% Reduced 33% Reduced 54% Reduced
Case study of
Jones Lang LaSalle
Pacific Place Office
Lighting control:
• Daylight responsive control
• Occupancy sensors
• Every solar exposure has a separate
control zone
• Interior spaces are separately
zoned for controlling lighting power
• Use of energy efficient lamps
• Utilise exterior lighting for function/
meeting rooms
• Utilise natural light from glass
window throughout office
Indoor lighting control:
• Reduce lighting power consumption
• Encourage the use of task lighting
• Work with potential tenants (LEED CI)
Nano Luminaire:
• Higher diffuse reflectance
• Wider spread of light rays
• Wider lighting coverage
• Maintain the lighting level with less luminaire to
save energy
• Nano luminaire achieves a minimum average lux
level at 300Lux and power density below 8w/sm
• Use of task lighting in an office can reduce energy
consumption and operational costs
DESIGN STAGE
3.3.3 Energy Saving Technology
Figure 3.3.23 Lighting Energy Saving Techniques in ICC
(Source: Kai Shing Management Services Limited)
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