Daysim 2.1

Dear colleagues,

My apologies for any cross postings.

The National Research Council Canada and the Fraunhofer Institute for Solar
Energy Systems have released version 2.1 of the Daysim daylighting analysis
tool. Daysim is based on LBNL's Radiance software and combines the Perez sky
model with a daylight coefficient approach to effectively predict the annual
daylight availability (daylight factor and daylight autonomy) in buildings
for multiple sites worldwide (you can import EnergyPlus epw climate files).
Daysim further features a user behavior model which allows to compare the
electric lighting use for manual and automated controls (occupancy sensor,
photocell control). The software runs under Windows and Linux OS and can be
downloaded from <> The following new
features have been added since version 2.0:

* extended tutorial: an extensive document to help newcomers to get
started with daylight simulations

* step-by-step instructions of how to import building scenes from
AutoCAD, SketchUp, and Ecotect into Daysim

* a list of case studies of how your colleagues have used Daysim in
actual building projects

* improved simulation output in html-format

* improved JAVA GUI with an extensive help file system

* based on Radiance version 3R6P1(latest version)

* the new version allows to model Radiance function file materials
(transdata, etc.)

Your comments/suggestions are appreciated. Best regards,


Christoph Reinhart, Ph.D. Associate Research Officer
National Research Council Canada NRC Construction
1200 Montreal Road M-24, Ottawa Ontario K1A 0R6 Canada
tel: (613) 993-9703 fax: (613) 954 3733

e-mail: <blocked::mailto:[email protected]>
[email protected]

The Lightswitch Wizard (initial design)
DAYSIM (expert software)
Radiance Workshop 2005

Hi list,

for all LINUX users out there that used to think gamma calibrating was for
wimps, just because they couldt do it under X, I thought I send you this
to an article titled
"Looking good: Monitor calibration under X". There are tons of other
interesting links included in the article, all about colour calibration of
monitors and printers.

Somewhere on the RADIANCE web site there is a test chart with some
instructions to go with it, but I doubt anybody has ever taken a look at

If you have no idea what Gamma calibration means, then DO read the article
and follow some links, no matter what system you use!