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## Main Question or Discussion Point

I need to calculate irradiance in a system shown on the image.

There is an infrared LED on the left and a diffuser in front of it. I need to calculate irradiance at a certain distance after the diffuser.

I think I first have to calculate irradiance at the diffuser. Then multiply it by the transmission of the diffuser to know how much radiation gets through the diffuser. That's where I don't know how to proceed. I don't know how to take into account the effect of radiation output angle from the diffuser.

There is an infrared LED on the left and a diffuser in front of it. I need to calculate irradiance at a certain distance after the diffuser.

I think I first have to calculate irradiance at the diffuser. Then multiply it by the transmission of the diffuser to know how much radiation gets through the diffuser. That's where I don't know how to proceed. I don't know how to take into account the effect of radiation output angle from the diffuser.