Knowing whether an LED luminaire is any good at doing what it says on the tin has long been a bugbear of the lighting specifier, so we are all grateful to the Lighting Industry Liaison Group for coming up with Guidelines for Specification of LED Lighting Products 2011 and even more grateful to those companies who've taken up the challenge of reporting the performance of their luminaires in this format.
So what's it all about?
The Liaison Group has asked all of those questions that we like to quiz company reps about when they come to call. It goes like this:
What is the Initial Lumen output of the LED luminaire?
What is its Lumen Depreciation over a stated life period?
What is the expected Failure rate over the stated life period?
What is the initial Colour Temperature and what shift is likely by the time it reaches 25% of its rated life.
What is the Colour rendering Index and what is the expected shift in CRI by the time it reaches 25% of its rated life?
And in terms of electrical performance
What is the total power consumed?
What is the initial Power Factor and what is the expected Power Factor by the time it reaches 25% of its rated life?
This is all great stuff and should cut down on the amount of time you spend making cups of tea for LED reps when they come a-calling.
And if you're looking at catalogue information that doesn't include this kind of detail chuck it away, because you wouldn't want to be specifying stuff that you don't know about now would you!
And here's a nice little document that you can read for a bit more detail:
A (very) basic guide to ethical specification
Lighting design: it's a client thing
Calculating obtrusive light: whose job is it?
When there's nothing in the catalogue
When is a chandelier not a pendant? When its a lantern!
When clients learn too much . . .
One of our details is missing
Where will light fittings come from?
The end of the light bulb?
Always something new . . . again
Always something new . . .
Combining old and new
On being in the dark . . .
Riffing The Internet of Things
John Bullock writes a regular column for lighting magazines. You can find all of the archived pieces here.
BLOGS - LIGHTING DESIGN
John Bullock writes about all things and anything concerning architectural lighting design; new technologies and old lamps; anything,really.
HOME LIGHTING CONSULTANT
John Bullock designs innovative lighting designs for people's homes. By working closely with clients he is able to deliver solutions that meet - and exceed - their expectations.
BLOGS - CPD RIBA CORE PROGRAMME 2015
John Bullock will be presenting a seminar on latest lighting design and technologies as part of the RIBA CPD Core programme 2015
BLOGS - SUSTAINABILITY
John Bullock believes that the UK lighting industry needs to embrace a sustainable way of delivering good quality product through good design, fabrication and end-of-life management.
BLOGS - LIGHTING HEALTH AND WELLBEING
Lighting has a vital role to play in our health and wellbeing.
CONDUIT (6) - Lighting for Winter Gardens
CONDUIT 5: Home Lighting - LED Lighting (2)
FX Magazine: Lighting Focus - Sustainability (Issue 258)
CONDUIT 4: Home Lighting - LED Lighting (1)
Can Smart Lighting Save The Planet?
CONDUIT 3: Home Lighting - The Bathroom
Can Lighting Save Us From Ourselves . . . NO!
CONDUIT 2: Home Lighting - The Dining Room