Page 87 - Hong Kong Green School Guide

3. Green School Guide - 3.3 Energy Saving
Hong Kong Green Building Council 85
Benefits
• Energy efficient lighting reduces energy consumption while also providing
adequate illumination; and
• Automatic lighting controls (e.g. motion & daylight) reduce unnecessary use
of artificial lighting and related energy consumption.
Issues to Consider
a. Opportunities
• Schools can retrofit and/or select more energy efficient lighting and adopt
lighting control that provide adequate illumination.
b. Constraints
• Some schools are still using electromagnetic ballasts for fluorescent tubes
(usually T8 tube). When upgrading fromT8 tube to T5 tube, installing adapters
or changing the whole system (luminaires, ballasts and lamps) can be labour
intensive; and
• Adding extra lighting at the control point in existing school can be complicated
due to the complexity of wiring or necessary replacement of existing circuits.
c. Solutions
• Schools in Hong Kong primarily use: fluorescent tubes, compact fluorescent
lamp (CFL) and halogen lights. Recommendation for lighting and control is
tabulated in the table on the next page.
• Lighting control and strategies that schools can consider include:
- - Daylight sensor (also known as photocell sensor) that operates (or dims)
the lighting according to daylight levels;
- - Motion sensor (also known as infrared red sensor) that operates the
lighting according to occupancy; and
- - Lighting control point (also known as zoning) means one control point
for one small zone within open plan space instead of one control point
for the whole open plan space. This prevents all lighting units within the
open plan space from being turned on when only a small zone requires
illumination.
3.3.6 Energy Efficient Lighting and Smart Control
Applies to NS & ES