Circadian Lab
See the light before you build it.
Melanopic EDI, illuminance and glare from real photometry, including daylight through windows and skylights.
Free, no signup500,000+ photometric filesWithin 5% of DIALuxWELL v2 and ANSI/IES RP-46-25
Three metrics from one calculation.
Each one is measured in seven directions at every grid point.
Illuminance
Lux and foot-candles on the task.
mel-EDI
At the eye, per CIE S 026.
Glare
UGR per observer, per CIE 117.
False colour and photometric rendering.
Both modes draw the same calculation.
Daylight is part of the same calculation.
NREL sun path, Perez sky, phase-correct moon.
Mixed CCT calculations.
Each fixture's colour is carried through every bounce.
Orbit, fly or walk.
Walk mode stands you at the occupant's eye height. The camera mode is saved into the share link.
In a headset
Walk it in VR.
Start from what you have
Import floor plans.
PDF, DXF, DWG, SVG, or a photo of a printed sheet.
Or scan the room with an iPhone.
LiDAR capture returns the walls, and the windows and doors arrive with real widths and sill heights.
A collimated disc at 2.5°.
The Virtual Sun holds its apparent size at any distance.
Six colour scales.
Including banded false colour. The numbers never move.
Share the exact scene as a link.
Reviewers open every saved view and pin comments on the model without a login.
Checked against the standards.
Compliance is evaluated automatically as you work.
A twelve-section PDF report.
Your logo, a four-page daylight study, ten export formats.
Circadian Lab runs in your browser.
Free, no signup, and nothing is uploaded.