[Bldg-sim] question regarding lighting efficiency/gains unitsofmeasurement
António Manuel Almeida
aalmeida at isec.pt
Wed Jun 4 02:44:09 PDT 2014
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
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