# \#daylight

**URL:** https://discourse.ladybug.tools/tag/daylight/41.md

[Latest](https://discourse.ladybug.tools/latest.md) · [Categories](https://discourse.ladybug.tools/categories.md) · [Tags](https://discourse.ladybug.tools/tags.md)

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## [Providing (approximate) visual transmittance from g-value/SHGC](https://discourse.ladybug.tools/t/providing-approximate-visual-transmittance-from-g-value-shgc/8739)

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**Author:** [@jwoodall](https://discourse.ladybug.tools/u/jwoodall)\
**Replies:** 6\
**Last updated:** [November 7, 2026, 11:24pm UTC](https://discourse.ladybug.tools/t/providing-approximate-visual-transmittance-from-g-value-shgc/8739 "2026-11-07T23:24:30Z")

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Hi all, I’m doing a parametric simulation of different facade variables, taking peak solar gain and daylight distribution for each iteration. One variable tested is the glass g-value (or SHGC), which I know has a relati…

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## [Rhino 9 for Mac compatibility with Ladybug/Honeybee on Apple M5 Pro](https://discourse.ladybug.tools/t/rhino-9-for-mac-compatibility-with-ladybug-honeybee-on-apple-m5-pro/40899)

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**Author:** [@maha](https://discourse.ladybug.tools/u/maha)\
**Replies:** 0\
**Last updated:** [November 3, 2026, 12:24am UTC](https://discourse.ladybug.tools/t/rhino-9-for-mac-compatibility-with-ladybug-honeybee-on-apple-m5-pro/40899 "2026-11-03T00:24:19Z")

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Hello, I am starting a daylight study and have not installed or purchased Rhino yet. My computer is an Apple M5 Pro Mac with 64 GB memory, and macOS Tahoe 26.5.2. Rhino’s download page offers Rhino 9, but the Ladybug …

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## [Minute-resolution WEA with Annual Daylight Enhanced](https://discourse.ladybug.tools/t/minute-resolution-wea-with-annual-daylight-enhanced/40792)

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**Author:** [@Guille01](https://discourse.ladybug.tools/u/Guille01)\
**Replies:** 2\
**Last updated:** [October 20, 2026, 6:47am UTC](https://discourse.ladybug.tools/t/minute-resolution-wea-with-annual-daylight-enhanced/40792 "2026-10-20T06:47:57Z")

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Hi Chris, I am working on a daylight-model validation using indoor measurements recorded approximately every minute. I came across these previous discussions: https://discourse.ladybug.tools/t/can-we-simulate-the-dayli…

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## [We are Adding 5 New Daylight Compliance Recipes to Ladybug Tools](https://discourse.ladybug.tools/t/we-are-adding-5-new-daylight-compliance-recipes-to-ladybug-tools/40514)

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**Author:** [@mikkel](https://discourse.ladybug.tools/u/mikkel)\
**Replies:** 16\
**Last updated:** [October 15, 2026, 1:24pm UTC](https://discourse.ladybug.tools/t/we-are-adding-5-new-daylight-compliance-recipes-to-ladybug-tools/40514 "2026-10-15T13:24:19Z")

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Hello Ladybug Tools community, As we announced earlier this year, as part of our goal of further integrating the LBT Grasshopper plugin with the needs of large professional projects, we are starting to expose new recipe…

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## ['1. Solution exception:Could not find a part of the path' for daylight simulation](https://discourse.ladybug.tools/t/1-solution-exception-could-not-find-a-part-of-the-path-for-daylight-simulation/18504)

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**Author:** [@Nimafo](https://discourse.ladybug.tools/u/Nimafo)\
**Replies:** 7\
**Last updated:** [October 1, 2026, 9:30am UTC](https://discourse.ladybug.tools/t/1-solution-exception-could-not-find-a-part-of-the-path-for-daylight-simulation/18504 "2026-10-01T09:30:04Z")

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Hi all, I get the following error on my daylight simulation. Warning: Roughness values above .2 is uncommon. Warning: Roughness values above .2 is uncommon. Runtime error (DirectoryNotFoundException): Could not find …

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## [\[URGENT\] Grasshopper Shoebox Daylighting Analysis](https://discourse.ladybug.tools/t/urgent-grasshopper-shoebox-daylighting-analysis/40736)

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**Author:** [@vealla](https://discourse.ladybug.tools/u/vealla)\
**Replies:** 1\
**Last updated:** [August 30, 2026, 10:06am UTC](https://discourse.ladybug.tools/t/urgent-grasshopper-shoebox-daylighting-analysis/40736 "2026-08-30T10:06:30Z")

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So I have difficulties on my assignment that requires me to analyze the interaction between Daylighting and Structure in a Tropical (A-Category) climate using Honeybee Radiance to evaluate how varying the window-to-wall …

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## [Ase calculation](https://discourse.ladybug.tools/t/ase-calculation/751)

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**Author:** [@MahsaZomorodian](https://discourse.ladybug.tools/u/MahsaZomorodian)\
**Replies:** 26\
**Last updated:** [August 27, 2026, 7:17pm UTC](https://discourse.ladybug.tools/t/ase-calculation/751 "2026-08-27T19:17:02Z")

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Hi Thank you for your great program. I was wondering how to calculate the ASE with honeybee. I can get the grid based percentage of time over 1000 lux over the year but this is not exactly what ASE is, do you have any…

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## [Free Future Meteorological Years (FMYs) for 5,000+ European locations](https://discourse.ladybug.tools/t/free-future-meteorological-years-fmys-for-5-000-european-locations/40704)

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**Author:** [@LittleBuddha](https://discourse.ladybug.tools/u/LittleBuddha)\
**Replies:** 0\
**Last updated:** [August 20, 2026, 10:52am UTC](https://discourse.ladybug.tools/t/free-future-meteorological-years-fmys-for-5-000-european-locations/40704 "2026-08-20T10:52:10Z")

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Following on from our TMY release, we’re excited to announce that Future Meteorological Years (FMYs) are now available on ClimateDataForBuildings.eu — giving practitioners a free, simulation-ready way to design for the c…

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## [UDI\_lower returns 0% for sensors with 0 lux all year (expected 100%)](https://discourse.ladybug.tools/t/udi-lower-returns-0-for-sensors-with-0-lux-all-year-expected-100/40659)

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**Author:** [@vall](https://discourse.ladybug.tools/u/vall)\
**Replies:** 1\
**Last updated:** [August 13, 2026, 11:52am UTC](https://discourse.ladybug.tools/t/udi-lower-returns-0-for-sensors-with-0-lux-all-year-expected-100/40659 "2026-08-13T11:52:51Z")

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Hi everyone, I’m using Honeybee LBT 1.10.0 and noticed something that I can’t explain in the Annual Daylight results. Some rooms in my model (toilets and a dressing room) receive no daylight at all. Every sensor in tho…

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## [Keeping HB Glass Modifier consistent with HB Window Construction](https://discourse.ladybug.tools/t/keeping-hb-glass-modifier-consistent-with-hb-window-construction/40658)

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**Author:** [@LiLi1010](https://discourse.ladybug.tools/u/LiLi1010)\
**Replies:** 2\
**Last updated:** [August 13, 2026, 12:17am UTC](https://discourse.ladybug.tools/t/keeping-hb-glass-modifier-consistent-with-hb-window-construction/40658 "2026-08-13T00:17:57Z")

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Hi, I run an energy simulation, and now I want to perform daylight simulations (daylight factor, point-in-time illuminance, sDA, and UDI). I want to ensure that the input of the HB Glass Modifier is consistent with my H…

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## [Make the output mesh transparent from LB Direct Sun Hours](https://discourse.ladybug.tools/t/make-the-output-mesh-transparent-from-lb-direct-sun-hours/40205)

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**Author:** [@Amaraa.N](https://discourse.ladybug.tools/u/Amaraa.N)\
**Replies:** 20\
**Last updated:** [July 22, 2026, 7:12am UTC](https://discourse.ladybug.tools/t/make-the-output-mesh-transparent-from-lb-direct-sun-hours/40205 "2026-07-22T07:12:20Z")

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Hello, I am currently testing some direct sun analysis and want to customize the result output. While I want to change the title of the analysis, I really want to make change in how the meshes are colorized since the ou…

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## [LB Incident Radiation — "invalid literal for float(): -nan(ind)"](https://discourse.ladybug.tools/t/lb-incident-radiation-invalid-literal-for-float-nan-ind/40422)

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**Author:** [@Romer](https://discourse.ladybug.tools/u/Romer)\
**Replies:** 5\
**Last updated:** [July 16, 2026, 6:28am UTC](https://discourse.ladybug.tools/t/lb-incident-radiation-invalid-literal-for-float-nan-ind/40422 "2026-07-16T06:28:31Z")

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Hi, I’m getting the following error when running LB Incident Radiation: Solution exception: invalid literal for float(): -nan(ind) My setup: Rhino units: millimeters Geometry: Flat planar srf. What I have tri…

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## [Error Running Radiance Simulation with the latest Ladybug tools version (1.10.0)](https://discourse.ladybug.tools/t/error-running-radiance-simulation-with-the-latest-ladybug-tools-version-1-10-0/40566)

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**Author:** [@AlexIordache12](https://discourse.ladybug.tools/u/AlexIordache12)\
**Replies:** 0\
**Last updated:** [July 15, 2026, 2:28pm UTC](https://discourse.ladybug.tools/t/error-running-radiance-simulation-with-the-latest-ladybug-tools-version-1-10-0/40566 "2026-07-15T14:28:47Z")

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Hi there, I recently upgraded to Ladybug tools version 1.10.0 and also upgraded my radiance to the 5.4 (2023-11-05) version as mentioned in the compatibility matrix. While installing I had an error regarding the PATH re…

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## [Honeybee radiance Hourly Lux values](https://discourse.ladybug.tools/t/honeybee-radiance-hourly-lux-values/15247)

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**Author:** [@Asisnath](https://discourse.ladybug.tools/u/Asisnath)\
**Replies:** 8\
**Last updated:** [July 7, 2026, 11:19pm UTC](https://discourse.ladybug.tools/t/honeybee-radiance-hourly-lux-values/15247 "2026-07-07T23:19:05Z")

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Hi all, Is it possible to derive hourly lux values from grid or sensors in Honeybee radiance as we could do in \[+\] version of honeybee. cc @chris

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## [Accelerating multiple "HB point-in-time grid-based" simulations](https://discourse.ladybug.tools/t/accelerating-multiple-hb-point-in-time-grid-based-simulations/30188)

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**Author:** [@Simon\_O\_Weber](https://discourse.ladybug.tools/u/Simon_O_Weber)\
**Replies:** 1\
**Last updated:** [July 1, 2026, 8:20am UTC](https://discourse.ladybug.tools/t/accelerating-multiple-hb-point-in-time-grid-based-simulations/30188 "2026-07-01T08:20:25Z")

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Dear scientific Ladybug community, within my research on switchable membrane cushion constructions I need the so-called incidence operator of the facade for different angles of incidence. (You can find more about the Ra…

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## [HB Shade not working](https://discourse.ladybug.tools/t/hb-shade-not-working/24564)

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**Author:** [@deepthi.ravi](https://discourse.ladybug.tools/u/deepthi.ravi)\
**Replies:** 7\
**Last updated:** [June 24, 2026, 1:46pm UTC](https://discourse.ladybug.tools/t/hb-shade-not-working/24564 "2026-06-24T13:46:05Z")

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The results for the energy analysis does not change irrespective of adding HB shades or not. I initially assumed that the shades are probably not too deep and hence there is no effect, but I tried adding very long overha…

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## [Inconsistent results](https://discourse.ladybug.tools/t/inconsistent-results/40470)

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**Author:** [@Rajath](https://discourse.ladybug.tools/u/Rajath)\
**Replies:** 3\
**Last updated:** [June 21, 2026, 9:19pm UTC](https://discourse.ladybug.tools/t/inconsistent-results/40470 "2026-06-21T21:19:45Z")

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Hi I’ve been doing some box model testing with a daylight factor analysis and have found that the DF result is inconsistent between runs with the exact same settings. For example, I am changing only the shade depth betwe…

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## [Honeybee daylight simulation grids](https://discourse.ladybug.tools/t/honeybee-daylight-simulation-grids/40472)

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**Author:** [@Nina](https://discourse.ladybug.tools/u/Nina)\
**Replies:** 2\
**Last updated:** [June 13, 2026, 8:32am UTC](https://discourse.ladybug.tools/t/honeybee-daylight-simulation-grids/40472 "2026-06-13T08:32:36Z")

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I have a irregularly shaped room, for which i want to do daylight simulation. I have been trying to make a 1m x 1m grid, but when i assign grid from room, the sensors points are clustered in some places screenshot : …

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## [How are people modeling simple trees that are not fully leafed? - Radiation Simulation](https://discourse.ladybug.tools/t/how-are-people-modeling-simple-trees-that-are-not-fully-leafed-radiation-simulation/40432)

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**Author:** [@remyweather](https://discourse.ladybug.tools/u/remyweather)\
**Replies:** 5\
**Last updated:** [June 9, 2026, 2:39pm UTC](https://discourse.ladybug.tools/t/how-are-people-modeling-simple-trees-that-are-not-fully-leafed-radiation-simulation/40432 "2026-06-09T14:39:40Z")

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Trying to come up with a simple way to model trees that are not fully opaque - 100% leafed, for the purposes of radiation / daylight and comfort simulation, when the tree is not fully opaque say in fall/spring and lettin…

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## [Multiple days for poin in time is possible?](https://discourse.ladybug.tools/t/multiple-days-for-poin-in-time-is-possible/40421)

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**Author:** [@gil](https://discourse.ladybug.tools/u/gil)\
**Replies:** 2\
**Last updated:** [May 27, 2026, 2:47am UTC](https://discourse.ladybug.tools/t/multiple-days-for-poin-in-time-is-possible/40421 "2026-05-27T02:47:10Z")

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Hi¡…is it possible to obtain lux levels (not UDI) in sensors, for more than one day?

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## [How to use HB Dynamic Shade Group component](https://discourse.ladybug.tools/t/how-to-use-hb-dynamic-shade-group-component/16316)

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**Author:** [@Matteo](https://discourse.ladybug.tools/u/Matteo)\
**Replies:** 10\
**Last updated:** [May 21, 2026, 2:06am UTC](https://discourse.ladybug.tools/t/how-to-use-hb-dynamic-shade-group-component/16316 "2026-05-21T02:06:33Z")

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Hello everyone, I have a question regarding how the dynamic shading group feature is working in the new LBT. In the example here I was trying to simply simulate a situation with two different states for my example (the…

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## [Installation plug ın - Ladybug](https://discourse.ladybug.tools/t/installation-plug-in-ladybug/40210)

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**Author:** [@Elvantrn](https://discourse.ladybug.tools/u/Elvantrn)\
**Replies:** 1\
**Last updated:** [May 13, 2026, 8:52pm UTC](https://discourse.ladybug.tools/t/installation-plug-in-ladybug/40210 "2026-05-13T20:52:31Z")

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Hi, I downloaded the latest version of Ladybug Tools and I am using Rhino 8. However, I cannot see the plugin inside Grasshopper. Could you please help me resolve this issue?

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## [Daylight simulation compliant with IES-LM-83-12 (WELL and LEED compliant)](https://discourse.ladybug.tools/t/daylight-simulation-compliant-with-ies-lm-83-12-well-and-leed-compliant/40326)

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**Author:** [@cheo081095](https://discourse.ladybug.tools/u/cheo081095)\
**Replies:** 2\
**Last updated:** [May 7, 2026, 6:52pm UTC](https://discourse.ladybug.tools/t/daylight-simulation-compliant-with-ies-lm-83-12-well-and-leed-compliant/40326 "2026-05-07T18:52:22Z")

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Hi Everyone, I am trying to get spatial Daylight Autonomy (sDA) results compliant with IES-LM-83-12, and thus, LEED and WELL compliant. This is achieved by mandating that simulation models use dynamic blinds (i.e. blind…

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## [Kinetic motion - deploy angle- crease angle](https://discourse.ladybug.tools/t/kinetic-motion-deploy-angle-crease-angle/40352)

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**Author:** [@hazel\_dn](https://discourse.ladybug.tools/u/hazel_dn)\
**Replies:** 0\
**Last updated:** [May 6, 2026, 6:31am UTC](https://discourse.ladybug.tools/t/kinetic-motion-deploy-angle-crease-angle/40352 "2026-05-06T06:31:16Z")

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When creating a kinematic motion, there should be a BREP, but when the deploy slider is moved, these two BREPs separate and move independently.

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## [Daylight simulation\_ split-blind](https://discourse.ladybug.tools/t/daylight-simulation-split-blind/40338)

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**Author:** [@Yiannis](https://discourse.ladybug.tools/u/Yiannis)\
**Replies:** 0\
**Last updated:** [May 1, 2026, 7:38am UTC](https://discourse.ladybug.tools/t/daylight-simulation-split-blind/40338 "2026-05-01T07:38:45Z")

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Hi everyone, I’m working on windows a daylight simulation in Ladybug Tools with Ladybug version 1.8. The simulation performs an annual daylight analysis for a room with dynamic shading. I would like to configure the…

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## [Daylight simulation - split-blinds in 2 zones](https://discourse.ladybug.tools/t/daylight-simulation-split-blinds-in-2-zones/40149)

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**Author:** [@Yiannis](https://discourse.ladybug.tools/u/Yiannis)\
**Replies:** 3\
**Last updated:** [April 24, 2026, 9:32am UTC](https://discourse.ladybug.tools/t/daylight-simulation-split-blinds-in-2-zones/40149 "2026-04-24T09:32:03Z")

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Hi everyone, I’m working on windows a daylight simulation in Ladybug Tools with Ladybug version 1.8. The simulation performs an annual daylight analysis for a room with dynamic shading (split-blinds in 2 zones) bu…

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## [LB Day Solar Information](https://discourse.ladybug.tools/t/lb-day-solar-information/40302)

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**Author:** [@Thomas](https://discourse.ladybug.tools/u/Thomas)\
**Replies:** 5\
**Last updated:** [April 23, 2026, 7:57pm UTC](https://discourse.ladybug.tools/t/lb-day-solar-information/40302 "2026-04-23T19:57:15Z")

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Hi, When I use the dl\_saving in the LB Day Solar Information component, it seems to shift an hour backward, instead of an hour forwards? kr,

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## [VLT specifications - Radiance](https://discourse.ladybug.tools/t/vlt-specifications-radiance/40281)

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**Author:** [@stefpapathan](https://discourse.ladybug.tools/u/stefpapathan)\
**Replies:** 2\
**Last updated:** [April 23, 2026, 3:00pm UTC](https://discourse.ladybug.tools/t/vlt-specifications-radiance/40281 "2026-04-23T15:00:14Z")

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Hello, When specifying the Visible Light Transmittance of the glass, why does the input vary from the output (see image below)? Am I missing something? Thanks, Stefanos

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## [Which Domain is More Suitable for Numerical and Visual Validation in Building Simulation?](https://discourse.ladybug.tools/t/which-domain-is-more-suitable-for-numerical-and-visual-validation-in-building-simulation/40177)

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**Author:** [@Zara](https://discourse.ladybug.tools/u/Zara)\
**Replies:** 1\
**Last updated:** [April 16, 2026, 2:13am UTC](https://discourse.ladybug.tools/t/which-domain-is-more-suitable-for-numerical-and-visual-validation-in-building-simulation/40177 "2026-04-16T02:13:45Z")

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Hi everyone, I am a PhD student working on integrating immersive environments with building performance simulation in architectural design. Based on recent literature, particularly a systematic review on daylight simul…

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## [Postdoctoral researcher in Building Energy Simulation, Multi-objective Optimisation and Control](https://discourse.ladybug.tools/t/postdoctoral-researcher-in-building-energy-simulation-multi-objective-optimisation-and-control/39060)

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**Author:** [@Neg](https://discourse.ladybug.tools/u/Neg)\
**Replies:** 7\
**Last updated:** [April 13, 2026, 1:24am UTC](https://discourse.ladybug.tools/t/postdoctoral-researcher-in-building-energy-simulation-multi-objective-optimisation-and-control/39060 "2026-04-13T01:24:36Z")

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Vacancy: Post-doctoral researcher (full-time) Qualifications: PhD in Building Science, Architectural Engineering, or a related field Term: 1 year, fixed term Start date: 1 October 2025 Location: Wellington or remote …

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