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Lighting Energy Audit
John Herbert
Registered Energy Assessor (REA)
Fluorescent fittings are the predominate choice for lighting
systems in commercial buildings, they are an excellent energy
efficient light source for the built environment. The majority
operate up to 20,000 hours with high efficiency (high lumens
per watt) and provide acceptable colour rendering.
Often replaced with LED type lamps, with equal lighting level and
significantly lower power consumption.
ABOVE: Lighting Simulation Study
Increasingly LED type lamps are gaining acceptance because the
lamp life span is significantly longer, with a significantly
lower power consumption, and lower heat output.
a lighting energy audit you will save money
In commercial office buildings, the lighting systems account
for more than 15% of the energy consumption and provide
significant opportunities for cutting operating costs.
Kelcroft's lighting energy audit expertise identifies
valuable energy and cost savings opportunities.
Lighting Simulation : Click image for larger view
Lighting Lux Level
What is the right quantity of light? We use the term LUX to
describe lighting level in a space, where the higher the
number the higher your energy bill.
ABOVE: Checking Lux Lighting Level on desk
For office general lighting level of 300-500 Lux would be
satisfactory, for a corridor or other transient areas
200 Lux would be adequate. However, our lighting audits
often Hong Kong offices have more than 1,000 Lux at
desk level.
Excessive or poor lighting can causes occupants to suffer
discomfort, eye strain, or headaches, so having the right
level is critical for productivity.
Using our own instruments we physically measure the existing lighting
level and record our findings. When excessive illumination is recorded
we make recommendations to reduce/upgrade the lighting system to the
recommended level saving money and saving energy.
The lighting level in perimeter areas that enjoy natural daylight can
avoid the cost of electric lighting during bright sunny days.
Natural Daylight Can Save Lighting Energy
Lighting Quality
The lighting installaton can impact the performance of daily tasks.
So for lighting performance, in additional to the lighting level,
we might also consider uniformity, which describes even
illumination across the space, and we could also consider the glare
index. But lighting quality is strongly influenced by the setting,
the reflectance of the walls, ceiling, floors, and even
the reflectance from your desk!
Technical data
Different lighting options, and wall finishes can all be
examined, modelled and finalised using the computer
modelling before any lighting fittings are purchased.
Delamping
Delamping is the term used to permanently remove a lamp or lamps
from a multi-lamp lighting fitting to lower the lighting level
and energy consumption, the impact can be modelled used lighting
software to determine the resultant lighting levels.
Call Kelcroft to order your lighting audit today!