Richard Hayes

Luminaire testing: absolute v. relative photometry

Richard Hayes is seething about testing! What’s going on? . Let’s clear this up once and for all. Most of the explanations I see regarding the distinction between absolute and relative measurement methods contain some good information – but miss some important facts.  To really understand this topic, you need to understand the different ways …

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The hidden problem in sealed-for-life LED luminaires.

The Light Review has been looking at sealed-for-life luminaires; those fixtures that come out of the brown box and get installed without anyone ever looking inside them, or thinking: What Happens Next? Richard Hayes has something to say: As responsible designers we are obliged to design for maintained illuminance.  When the Maintenance Interval prescribed in …

The hidden problem in sealed-for-life LED luminaires. Read More »

New Lighting Products

Producing photometric data – what do we need?

Specification of data required for a luminaire – photometric data There is a practical reason for data collection on luminaire performance to be standardised. With BIM (Building Information Modelling) becoming a design process norm and specialist specification companies like Spektd coming to market, manufacturers will need to respond in a positive way. The Light Review …

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