Download DAYSIM 4.0.0 from our software library for free. Our antivirus check shows that this download is malware free. The size of the latest installer available is 18.2 MB. DAYSIM relates to Photo & Graphics Tools. The most popular versions among DAYSIM users are 4.0, 3.1 and 2.1. This free PC program was developed to work on Windows XP, Windows Vista, Windows 7, Windows 8, Windows 10 or Windows 11 and can function on 32-bit systems. The actual developer of the free program is Christoph Reinhart.
From the developer:
DAYSIM is a validated daylighting analysis software that calculates the annual daylight availability in arbitrary buildings based on the RADIANCE backward raytracer. It uses the Lightswitch occupant behavior model to mimic occupant use of personal controls such as light switches and venetian blinds and to predict energy savings from automated lighting controls such as occupancy sensors and photocell controlled diming systems.
You may want to check out more software, such as UrbanDaylight for Rhino, which might be similar to DAYSIM.