27 Dec '14, 6pm

Do you have some spare time between turkey sandwiches? Read more about #green #lighting!

Building Regulations (Part L) currently determine that 'low energy' status begins at 45 lamp lm/cctW (lamp lumens per circuit Watt) for domestic installations or 55 luminaire lm/cctW for non-domestic installations. (There's other stuff going on, but this will do for our purposes). How should we read these figures? For domestic work it's fairly straightforward. If you're using a light fitting that takes a lamp with a better efficiency than 45lm/cctW then you're over the first hurdle to a 'green scheme'. Also, it doesn't matter what the light fitting is - you could hide a CFL (compact fluorescent lamp) in a hessian sack and it would still comply. Though other questions may well be asked. For non-domestic specifications the goalposts shift around to make life a bit more difficult. Now we're talking about luminaire lumens/cctW so it's all about the efficacy of the light fittin...

Full article: http://www.greenspec.co.uk/building-design/green-light-ex...

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