[Bldg-sim] question regarding lighting efficiency/gains units ofmeasurement

[António Manuel Almeida]

Hi, everyone.

I think that we are talking about W/m^2 per 100 lux. This is the measure for maximum lighting power density (LPD) in some
European countries regulations like from Portugal or Spain.
An example: if the maintained average illuminance in a room is 300 lux and the maximum LPD per 100 lux is 2,5 W/m^2
then the maximum LPD for that room is 7,5 W/m^2. 
If you want a similar measure with US standard it will be something like W/ft^2 per 10 fc or other illuminance quantity.

Best Regards.
António Manuel Almeida
aalmeida at isec.pt
INESC Coimbra
Portugal

  ----- Original Message ----- 
  From: Christian Stalberg 
  To: bldg-sim at lists.onebuilding.org 
  Sent: Wednesday, May 28, 2014 11:21 AM
  Subject: [Bldg-sim] question regarding lighting efficiency/gains units ofmeasurement


  In Europe one sees W/m2-100 lux as a measure of lighting related gains or lighting efficiency. What is the equivalent here in the states? I suspect it is a messy conversion.

   

  Thank you in advance.

   

  Regards,

  _

  Christian Stalberg

  Natural Intelligence, LLC

  http://naturalintelligence.us

  Tel. 415.531.4610

   



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