Lighting calculations

Singapore, 21st February 2011

Lighting calculations are as good as the person who enters the parameters of the calculations in the computer, isn’t it? I have blogged about this before. I am currently doing some lighting expert assessment work for lighting designs done by a manufacturer. In this case the client wants a professional and independent lighting designer to “certify” that the lighting design is compliant to international standards.

It is understandable that a client would like an independent professional to verify the truthfulness of the lighting calculations as calculations can be manipulated to get the desired results. Generally the end-user/ client does not have that expertise hence their appeal to an expert. There are many parameters that can be manipulated. Assuming here that the correct IES photometric files are being used there are many input variables can influence the outcome. For instance has a maintenance factor been included (we need maintained values not new values)? That in itself can make 20 to 30% difference in the end result depending what standard is being applied. Another parameter is the calculation surface, calculation grid and plane height. Was the result measured at floor level or at working plane level? Are the calculation points spaced out properly? All these variables will have an impact on the final calculation results. Most applicable standards will highlight what the measurement grid is and whether the measurements should be taken at ground level working plane level or even higher. Obviously the higher, the closer you are to the emitting light source, the higher the resulting lighting levels

Assessing lighting calculations therefore requires experience and understanding of the variables and their impact on the end result. Please note I am not insinuating that reputable manufacturers like the one I am currently “investigating” are deliberately manipulating the input to get the desired results, on the contrary. Unfortunately however there are some who do and in the process they spoil the market…

In Light Watch today I am sharing one of the top spots for dining in Singapore, Sky on 57, one the roof top of Marina Bay Sands. I had the honor of being invited for dinner there last weekend. The restaurant is run by famous Singapore chef Justin Quek, who entertained us with his stories on how he sources his food from all parts of the world.


Light Watch 36: Sky on 57, Marina Bay Sands, Singapore

21. February 2011 by Martin Klaasen
Categories: light watch, lighting standards | Leave a comment

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