A detailed 3D simulation tool designed to predict daylight, and the appearance of internal spaces prior to construction.

Add To Quote  


  • Design the optimal lighting system for your building and the people who use it, taking into account quality of both natural and artificial light
  • Visualise how brightness and glare influences a building occupants visual comfort
  • Investigate daylight dimming opportunities and quantify energy reductions by linking to ApacheSim
  • Undertake Right-to-light studies and test how different lighting schemes will look and perform
  • Utilise our Climate Based Daylight Modelling (CBDM) technology to model space performance
  • Produce photo-realistic rendering images based on detailed physically accurate lighting simulations
  • Ability to run multiple calculations and dynamic simulations simultaneously using the Parallel Simulation Manager
  • Faster simulations via Accelerad – up to 20 times quicker! Accelerad uses the power of the GPU to provide faster static and dynamic simulations.

> Technical Details


IES VE Radiance showing Electric Lights

IES VE Radiance

RadianceIES screenshot

RadianceIES screenshot

RadianceIES screenshot

IES VE Radiance- False colour

IES VE Radiance - Lux Contours

VE Radiance - Contours

VE Radiance - Contours

VE Radiance - Glare

Technical Details

This application uses sophisticated ray-tracing techniques to produce a physicially accurate representation of light distribution. It can take into account:

  • Position of your building and site
  • Time of day and date
  • Sky conditions
  • Material properties
  • Shading surfaces
  • Adjacent buildings

Simulations can include detailed complex geometry and a wide variety of material types. Both luminance (what your eye sees) and surface or working plane illuminance (what the surface receives) can be analysed.

Input Options

  • Parameters
    • Date & time
    • Sky conditions (from selection of internationally recognised conditions)
    • Working plane (if required)
    • Eye & focus positions (apply graphically or numerically)
    • Glare threshold
    • Inclusion / exclusion shading surfaces: adjacent buildings, topographical shades, local shades
    • Option to choose sky resolution to speed up calculation of daylight coefficients  
  • Surface Properties
    • Integrated to project construction database 
    • Apply colour – including components and shading surfaces
    • Select material properties from a pre-defined list
    • Create patterns of varying textures
    • Bidirectional Scattering Distribution Function (BSDF)
  • Components
    • Add from the global components library and amend if required
    • Create your own
    • Define which to include / exclude
  • Image Properties
    • Field of view
    • Size
    • Quality
  • Luminaires (if using in conjunction with LightPro)
    • Define which to include / exclude
    • queue any number of simulations and run at pre-defined times for increased efficiency (e.g. outside office hours)
    • include components such as tables, chairs and people to make images more realistic

Output Options

  • Lux Levels (Illuminance)
    • Rendered image or tabular text
    • Figures displayed at any point on the image – grid
    • At a defined working plane height
    • Contour line, contour band and false colour images
    • Jpg & bmp file format export
  • Daylight factors (Illuminance)
    • Rendered image or tabular text
    • Figures displayed at any point on the image – grid
    • At a defined working plane height
    • Contour line, contour band and false colour images
    • Jpg & bmp file format export
  • Glare (Luminance)
    • Rendered images with glare indices overlay
    • Table showing Guth Index, CIE Index, Unified Glare Index
    • Daylight glare probability index
    • Jpg & bmp file format export
  • Climate Based Daylighting Metrics
    • Useful Daylight Illuminance (UDI)
    • Spatial Daylight Autonomy (sDA)
    • Annual Sunlight Exposure (ASE)
    • Coloured analysis bands and contours can be shown on 3D ModelViewer
  • Summary Information
    • For each image information on type of simulation, eye and focus points, day, time, sky conditions and ground ambient illuminance is provided
    • If used with LightPro a summary of all luminaires detailing room, position and whether switched on/off is provided