Differences between Radiation results of LB components

[chris]

Hey @Arding ,

I suggest that you use the LBT 1.6 plugin instead of Legacy Ladybug. The Legacy Ladybug radiation analysis did not include an emissive ground hemisphere, which helps approximate the solar radiation that would be reflected off the ground onto the geometry.

The LBT plugin’s LB Incident Radiation component includes this ground hemisphere as you can see here:

Difference Between "LB Incident Radiation" and "Ladybug Solar Radiation" Components

Good question and this is directly linked to what I said here: In LBT, we do the ray tracing for a full sphere around each point so that we can account for the radiation that’s “reflected” off the ground (technically, we’re doing this by assuming an emissive ground hemisphere that has 0.2 the intensity of the sky hemisphere, much in the same way Radiance does). In legacy, we only looked at the radiation coming from the sky dome, which was ok for some purposes but could be 20% less than expect…