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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Electrical Questions >> cat 2 lighting https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1252086799 Message started by scotspark on Sep 4^th, 2009, 6:53pm

Title: cat 2 lighting
Post by scotspark on Sep 4^th, 2009, 6:53pm

I was at a job the other day and one of the office staff complained that one of the new cat2 lights we fitted last month causes reflection of the 2 pc keyboards below

when you are sitting down it is hard to see the writing on the buttons because of this.

never had this before any ideas??

new keyboards?? the are both HP

cheers SS

Title: Re: cat 2 lighting
Post by CWatters on Sep 4^th, 2009, 8:27pm

I would recommend they try different keyboards.. Google found a few people have problems with HP keyboards... seems to be mainly the metalic ones..

http://www.google.co.uk/search?hl=en&q=HP+keyboard+%22hard+to+see%22+&meta=

Title: Re: cat 2 lighting
Post by londonman on Sep 5^th, 2009, 6:41pm

Keyboards..that brought back memories of unexplained problems. Many years ago way before PCs became ubiquitous, I installed a humble word-processing system in a solicitors. A few days later they rang to complain about random characters appearing on the screen. I went to check it out but coudn't find anything. Replaced the keyboard. All seemed OK. About a week later, they rang again. Same problem. Random characters. So I went back, couldn't find anything wrong. This time replaced the whole computer and keyboard. All seemed OK.

A week went by and then they called again -seriously pissed off- still random characters. So I called in again and noticed a new member of staff who I'd not seen before. She was extremely well-endowed but also short sighted and vain. So she wouldn't wear glasses and so to see the characters properly, you guessed it........

It took all my diplomatic skills to explain the problem!

Title: Re: cat 2 lighting
Post by scotspark on Sep 6^th, 2009, 5:18pm

that seems to be laptops

this is a standard black keyboard with white letters

Title: Re: cat 2 lighting
Post by CWatters on Sep 6^th, 2009, 8:12pm

I have a black on white keyboard and it's hard to provoke a problem.

Did some googling but all I could find was this which suggests it's all a lot harder than just wacking up some CAT 2 lights...

http://www.right-of-light.co.uk/calculations.htm

Quote:

Luxo Lighting specialists still come across organizations that have been influenced to install mainly Category 2 overhead luminaries (or possibly Category 1 or Category 3) without any regard to equipment layout and the type of work being done. This usually does not meet the regulations. The geometry between eyes, screen and luminaire is critical and almost comparable to the alignments necessary to produce a total eclipse of the sun. Seriously, it is far more critical than those involved usually imagine, and should not be approached simplistically if there is to be any chance of achieving the necessary objectives.

In contrast, illumination of the background general office area using uplighters is a far less critical exercise, depending on three easy to achieve criteria.