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Topic Title: Old cat 2 lighting
Topic Summary: Replace with?
Created On: 07 January 2013 10:26 PM
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 07 January 2013 10:26 PM
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Fm

Posts: 682
Joined: 24 August 2011

Along time ago cat 2 fittings were thrown up with wild abandon.

Moving forward from 1995 now that crt displays are nearly thing of the past.
Can any light fitting be used, was looking at a few thorn College fittings.

Any opinions?
 07 January 2013 10:44 PM
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DOUGIE1000

Posts: 4168
Joined: 13 August 2005

used the thorn college before, pricey if i remember right.

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Dougie
Power Plus Electrical.co.uk

My mission is to live as long as possible......so far so good!
 07 January 2013 11:14 PM
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OMS

Posts: 19693
Joined: 23 March 2004

The category of lighting (or luminaire classification) is now defunct - basically because it was minunderstood and badly implemented by many people.

The requiremets however, for proper illumination ratios between wall and task and ceiling and task are still there from the old LG3 (this was the bit that was misunderstood initially, resulting in "I want Cat 2 and 500 lux on the desk please" being the standard developers spec. No attempt was made to determine how a luminaire worked in a particular space - you find cat 2 in cellular offices for example where it would be impossible from any loacation other than flat on your back to get a glare issue rom even a basic prismatic.

You still need to deal with the veiling reflections and glare issues, but modern screens are are far less sensitive to "glare".

You could go with Thorn College luminaires depending on what type of space you have - basically though, what you want is proper illumination ratios based on a sensible task illuminance with a high efficiency luminaire that offers some zonal protection for screen based tasks.

It may not be entirely applicable to your space, but i suggst a quick google for LG7 - there are plenty of short documents setting out the problem and the solutions.

regards

OMS

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