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LED’s - Fade Away, Don’t Radiate

Author: Kevin Stubbs FSLL
Date: 26/09/2019

Kevin Stubbs FSLL - Technical Sales Manager at Llumarlite, challenges you with a question – Can you really fit & forget with all LED lighting?

I was recently reminded that customers may not always get what they had originally expected!

How long do you think these “browned out” LED panels have been installed?

These panels have served just 12-15,000 hours, they are about 2 ½ years old!!

As you can see – the panels in this installation now exhibit a rather lovely brown patch across two thirds of their diffuser, dramatically reducing the effective radiation of light output. It would appear that sometimes poor combinations of technologies can limit progress, here we seem to be sinking back to the dark ages – when we thought inefficient lighting was fluorescent “troffer packs” and yellowing non-UV stable polystyrene diffusers!

Well, yes – maybe we are taking two steps forward and one step back; maybe the buyer didn’t notice his “bargain” luminaires might include a poor combination of diffusers, perhaps a light guide of a less than desirable material. Worse still, in some places you can now see which ones have been installed in a different orientation. Luckily they have separate standalone emergency lighting so the depreciation does not affect life safety systems. Oh – and it would appear that most of the LED’s themselves haven’t yet failed (what does that warranty say?)


LED Panel users beware – consider these lighting engineering facts before you select luminaires….

What could a user gain by using a different style of luminaire?
ie-  back – lit construction rather than a flat panel :-

Call Llumarlite if you’d like our help with a pocket and environmentally friendly competitive through life lighting solution, together we can help you select the right solution to minimise your operating costs and maximise benefits!

Links –
The “SLL Lighting Handbook 2018” is available to download free to CIBSE / SLL Members: - Here  Publisher CIBSE, Product Code LH2018, ISBN   9781912034413


Llumarlite blogs

LED Healthcheck

How Much Is That LED In The Window The One With The Waggly Tale

What Do I need from a Light Sorce - Free 16 Page Guide


Contact us for more information on this topic or to find out more on ways we can help with your lighting.

Phone Tel: 01296 436666



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