How to define reflectance of near infrared of solar radiation


Im investigating reflected light of sun from glazing of buildings with “Honeybee_Run Daylight Simulation” component.

Radiance materials can be set reflectance of each RGB.

Then, can I define reflectance of near infrared(NIR, unvisible light) of solar radiation?

Is the NIR reflectance equal to RGB reflectance?

I apologize for my poor English.

Thank you.

Hi Natchan,

I don’t know the answer to this question and actually I’m very interested to know the answer. I sent a similar question to Radiance group while ago (, and I haven’t heard back. Maybe you want to send your question to the radiance mailing list too. You can subscribe here:


Hi, Mostapha.

I will try to ask on radiance email list for the question.

Thank you for your reply.

Hi all,

I am currently doing a program to calculate the solar factor of a façade which take into account visible and infrared radiations. That’s why I’m interested in the discussion… Did you have a response from Radiance group ?