[Bldg-sim] Daylighting Calculations for LEED

[Rob Guglielmetti]

Hi Tariq,

When you say "differed", what exactly do you mean? Dialux is radiosity based (like AGI32 and dear departed Lightscape), whereas Relux uses Radiance as the engine so it's essentially a raytracing-based simulation program. Different simulation algorithms, but both are valid approaches in general. In the general sense, especially in the context of documenting LEED certifications, I think both approaches have merit. 

- Rob Guglielmetti

On Feb 14, 2010, at 2:43 AM, Tariq Abbas wrote:

> I used dialux and  found it differs compared to Radiance. A better fit
> is relux. 
> 
> -----Original Message-----
> From: bldg-sim-bounces at lists.onebuilding.org
> [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Rob
> Guglielmetti
> Sent: 13 February 2010 01:27
> To: bldg-sim at lists.onebuilding.org
> Subject: Re: [Bldg-sim] Daylighting Calculations for LEED
> 
> I ran into limitations with the USGBC's other compliance demonstration
> methods all the time at my last job; the so-called glazing factor
> spreadsheet can only deal with very basic space types. I always used
> Radiance for my simulation-based documentation, because it's what I'm
> familiar with. But folks here have mentioned the other popular ones. Any
> lighting simulation software that includes a daylight simulation
> component will likely work, as long as you can set up grids and define
> standard CIE clear and overcast sky types (depending on which compliance
> path you're using). Lumen Designer is no longer commercially available,
> but as mentioned, AGI32, Radiance, and also 3DStudio Max Design can all
> be used for these types of simulations when the spreadsheet the USGBC
> provides falls short. DiaLux is a freely available (Windows) program
> that incorporates daylighting calculations as well:
> 
> http://www.dial.de/CMS/English/Articles/DIAL/DIAL.html?ID=1
> 
> - Rob Guglielmetti
> 
> On Fri, February 12, 2010 2:05 pm, Nick Caton wrote:
>> I regularly use AGI32 for any daylighting studies, though I've not yet
> 
>> been involved in a project where that credit was not handled by the 
>> non-photometric options of documenting compliance.
> 
> 
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