[Bldg-sim] question regarding lighting efficiency/gains unitsofmeasurement

[António Manuel Almeida]

Hi again.

The acceptable illumination levels for non-residential buildings are prescribed in
"EN12464-1 Light and lighting - Lighting of work places - Part 1: Indoor work places".
To avoid excessive lighting, in Portuguese legislation the average illuminance level
shall not be exceeded by more than 30% from the standard prescribed illuminance.

Regards.
António Manuel Almeida
INESC Coimbra



  ----- Original Message ----- 
  From: Nick Caton 
  To: António Manuel Almeida ; Christian Stalberg ; bldg-sim at lists.onebuilding.org 
  Sent: Thursday, May 29, 2014 5:53 PM
  Subject: RE: [Bldg-sim] question regarding lighting efficiency/gains unitsofmeasurement


  Ah, this bridges the gap of understanding much better – thanks for the example António!  

   

  To date, I have not yet encountered a “W/ft^2 per 10fc” requirement.  Our lighting power densities are typically prescribed more simply per space type or per building/project type to establish a ceiling for maximum installed lighting (for example: Offices are 0.9 W/ft^2, Parking Garages are 0.25W/ft^2).  The actual figures prescribed of course vary quite a bit depending on where you are and what energy standards/codes are being enforced (if any).

   

  In the USA, I have not LPD requirements tied additionally to targeted illumination levels (at least in such a direct fashion).  Does that mean in Europe, energy codes essentially prescribe acceptable illumination levels appropriate per space type or application, or is it still left up to the lighting designer/engineer to assert what’s appropriate?  

   

  ~Nick

   

   



   

  NICK CATON, P.E.

  SENIOR ENGINEER

   

  Smith & Boucher Engineers

  25501 west valley parkway, suite 200

  olathe, ks 66061

  direct 913.344.0036

  fax 913.345.0617

  www.smithboucher.com 

   

  From: Bldg-sim [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of António Manuel Almeida
  Sent: Thursday, May 29, 2014 5:10 AM
  To: Christian Stalberg; bldg-sim at lists.onebuilding.org
  Subject: Re: [Bldg-sim] question regarding lighting efficiency/gains units ofmeasurement

   

  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

     


----------------------------------------------------------------------------

    _______________________________________________
    Bldg-sim mailing list
    http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org
    To unsubscribe from this mailing list send  a blank message to BLDG-SIM-UNSUBSCRIBE at ONEBUILDING.ORG

   


------------------------------------------------------------------------------


       Este email está livre de vírus e malware porque a proteção avast! Antivirus está ativa. 
       

   


---
Este email está livre de vírus e malware porque a proteção avast! Antivirus está ativa.
http://www.avast.com
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20140604/7edb3931/attachment.htm>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: image/jpeg
Size: 1459 bytes
Desc: not available
URL: <http://lists.onebuilding.org/pipermail/bldg-sim-onebuilding.org/attachments/20140604/7edb3931/attachment.jpeg>