How do we do the interior lighting design analysis?

Interior lighting design analysis is one of the indoor environmental qualities that green buildings address.

There are two objectives in achieving IEQ (BEAM Society):

1) Ensure the adequacy and maintenance of visual comfort conditions achieved by the electric lighting provisions in occupied spaces;
2) Ensure artificial lighting provisions in common areas and service areas such as plant rooms.

How do we do the interior lighting design analysis? The answer is the modelling method, calculation and assumptions.

First, we will identify a daylight scene to take daylighting into account during the calculation to build the lighting model. Depends on the user’s selection, a specific time or different sky models can be adopted.

Next is to insert a new room in the model. The size of the room, the material of the ceiling, walls and floor are defined. The user can customise the reflection factor or follow the default setting of the corresponding building material. Room elements such as windows, doors or pillars are then inserted into the created room.

After completing the building shell, the model will indicate to add indoor lighting. The luminaire can be selected from the database or customise by the user. If custom lighting is used, the luminous flux, power, light colour information is required.

To calculate the Lux level (the standard unit for measuring the light level intensity) of the indoor area, we will have to insert a calculation surface specifying the assessment height after all the parameters mentioned above are correctly inputted. We can export a contour showing the Lux level at the calculation surface from the program.

It is essential to conduct an accurate analysis that can be used to prove and apply a reputable certification such as green building certification. Our track record is conducting a daylight access analysis for a 30-Classroom Secondary School at Development in Hong Kong to evaluate the potential sensitivity to the adjacent residents and government institutions, the interior lighting design, and pursue the BEAM Plus certification.

Utilising the DIALux lighting design software to evaluate the Site’s interior lighting design, we considerably assess the quality and quantity of the lighting system performance. The analysis includes maintaining horizontal and appropriate vertical illuminance, illuminance variation, limiting glare index, colour rendering, and modulation of light output applicable to the type and use of the premises/indoor spaces.

We strictly comply with the authoritative guidance:

* CIE Standard S 008/E Lighting of Indoor Work Places
* CIE 117- 1995 Discomfort Glare in Interior Lighting
* The Chartered Institution of Building Services Engineers
* Code for interior lighting (CIBSE) and Illuminating Engineering Society of North America
* Lighting Handbook, Reference & Applications (IESNA) publications, or equivalent

and attentively focus on the specific requirements on lighting for comfort and productivity and excluding the non-requested information from consideration. This project has been finally awarded BEAM Plus V1.2 for NB IEQ 16 & 17.

Lighting quality is a complicated subject and integrates task performance, visual comfort, social communication, mood, health, safety, well-being and aesthetic judgment. It is also related to economics and the environment regarding the installation, maintenance and operation of the lighting system. Proper lighting maintenance practice, such as cleaning lamps, luminaires, and replacing lights periodically to avoid depreciation, is crucial to maintain good lighting quality throughout the whole life of the lighting installation. Besides energy conservation, power quality and control benefit from dimmable high-frequency electronic ballasts. The high-frequency modulation avoids the problem of ‘flicker’ that can occur when using mains frequency ballasts.

We spend long hours indoors for almost 90%. Let’s consider the importance of indoor environmental quality and have it improve for our humanity.

By: ANewR Consulting Limited, a digital environmental consultant headquartered in Hong Kong since 2008. Our expertise has grown into the context of air and water qualities, noise, green building, waste management, and remediation. With extensive know-how in environmental planning and assessment, feasibility study and policy review, ecological design, monitoring, and audit (EM&A), ANewR has matured to be a leading management consultancy. Standing in the digital transformation reign, ANewR has participated in various environmental digital projects – interactive 3D visualisation, immersive automation virtual environment, Virtual reality, automation system, and monitoring platforms.
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