[Radiance-general] RE: 60Watt bulb luminaries data

[Martin Moeck]

Model comparisons are tricky. All sorts of calibration and measurement error5s occur.  Do not use a 0.5 m box because it is too small (near field photometry problems). In addition, black has a reflectance of 5% unless you have a heavy sand texture, which gets it down to 2%. 
 
A comparison between radiosity code and radiance code is at 
 
www.personal.psu.edu/mum13/agi_rad.pdf
 
 
The reflectance is 50% diffuse.
 
Martin, Penn State
 
P.S. I would have to run point by point values to do a complete error analysis, but either Radiance or AGI32 1.7 draws the PAR beam not right. The Radiance beam looks a little bit too soft. 
 
 
 
 
------------------------------------------------------------
 
Hi Martin,

Thanks for the reference file.

Have you published any comparison or know of any comparison for lamps and
enclosures such as a black box?

I have constructed a simple 0.5 cube with black walls and lamp socket
central to the ceiling. Should I replace my GE lamp with the PAR lamp?

With the par lamp file you sent me, do I simple draw the lamp as per its
actual dimensions, and assign the rad file to it?

Regards, and thanks for the help,

Anthony



	-----Original Message----- 
	From: Krzysztof Wandachowicz [mailto:Krzysztof.Wandachowicz at put.poznan.pl] 
	Sent: Thu 7/1/2004 10:29 AM 
	To: Radiance general discussion 
	Cc: 
	Subject: Re: [Radiance-general] RE: 60Watt bulb luminaries data
	
	

	You can find prepared files for incandescent lamp with clear bulb. The
	only thing you should change is luminous flux in klm, because these
	files are prepared for 100W lamp. Change the line "3 1.35 1.35 1.35" in
	z100p.rad file for "3 0.71 0.71 0.71".
	
	You can find these files at:
	http://lumen.iee.put.poznan.pl/kw/oprawy/z100p.rad
	http://lumen.iee.put.poznan.pl/kw/oprawy/z100p.dat
	
	Descriptions are in polish because these materials I've prepared are for
	my students.
	z100p.rad includes all information about lamp, this lamp is assumed as
	small sphere 0.01 radius.
	z100p.dat includes information about light distribution of 100W
	incandescent lamp.
	
	You have to use Radiance instead of Desktop Radiance to prepare
	calculation.
	
	Good luck!
	
	Krzysztof.
	
	----- Original Message -----
	From: "Anthony J. Farrell" <anthony.farrell at dit.ie>
	To: <radiance-general at radiance-online.org>
	Sent: Wednesday, June 30, 2004 1:42 PM
	Subject: [Radiance-general] RE: 60Watt bulb luminaries data
	
	
	> I am currently carrying out basic validation techniques of the Radiance
	> software using a black box and standard 60Watt bulb therein.
	>
	> I cannot locate a standard incandescent 60W bulb (just bare hung from
	> ceiling, no lamp shade) on the desktop radiance program.
	>
	> Can anyone help me by way of an add on file for a standard light bulb
	(even
	> if not 60W!) or refer me to a suitable IESNA file?
	>
	> Kind regards
	>
	> Anthony
	>
	> -----Original Message-----
	> From: radiance-general-bounces at radiance-online.org
	> [mailto:radiance-general-bounces at radiance-online.org]On Behalf Of
	> radiance-general-request at radiance-online.org
	> Sent: 30 June 2004 10:59
	> To: radiance-general at radiance-online.org
	> Subject: Radiance-general Digest, Vol 4, Issue 25
	>
	>
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