Richard Hayes shouts through the letterbox to let us know that there’s been a change to the way that Relux calculates Maintenance Factor. We’ve spoken about this before (Getting Maintenance Factor Right) – and here we are again. This is Important Stuff! . Richard says: Maintenance Factor calculation for LEDs Since 2019 there has been
Relux updates calculation method for Maintenance Factor Read More »
Richard Hayes writes: Whenever I deliver the ICEL course on Emergency Lighting Legislation and standards for the LIA, I keep getting told that consultants and specifiers are using BS 5266 part 1 as a specification. I have written the article attached to point out why this is annoying and wrong. So: when is a standard
When is a standard not a Standard? Read More »
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
Luminaire testing: absolute v. relative photometry Read More »
“What does off mean?” In the good/bad old days you turned off your lights with a physical switch. This device broke the circuit between the load and the device so no current could flow. As a result no more light was emitted. “Simples” as the Meerkat would say. These days things are not quite so
Richard Hayes asks: is that light OFF? Read More »
We recently posted an investigative piece, looking at the provenance of a Philips IP65 batten that scared the contractor so much that he had it removed from the project. In that piece, I flippantly referred to the stated 50,000 life of the batten, forgetting that Richard Hayes, blessed contributor to these pages, has a few
Getting Maintenance Factor right Read More »
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 »
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
Producing photometric data – what do we need? Read More »