Hi @SaeranVasanthakumar ,
Sorry if my answer was tangential to what you were asking. You are right that modeling the Solar Transmittance of the glass with Radiance is not the same as modeling the total Solar Heat Gain though the glass, which should account for BOTH transmitted solar AND the solar energy that gets absorbed by the glass and then conducts to the interior.
So it just comes down to whatever metric @yewi needs to evaluate the glass. If transmitted solar is all that’s needed (eg. if you were studying the impact of shortwave solar on thermal comfort), then using Radiance is fine. But, if the total solar heat gain is needed for something like a Room load balance, then you’re right that EnergyPlus should be used instead of Radiance.