Kelcroft E&M Limited John Herbert
unit A10 Kowloon Bay Hong Kong
+852 2335 9830
home > services > lighting energy audit

Lighting Energy Audit

Registered Energy Assessor Hong Kong
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.

lighting energy audit

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 energy audit

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.

lighting energy audit

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.

energy audit lighting, daylight

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!

energy audit lighting performance

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 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!

Related Reading


#energyconsultant #lighting #energyaudit #hongkong #modelling #light
date: 17-10-21
kelcroft consultants hong kong