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During the Performance Period

The daylight prescriptive path requires your team to track down information on VLT—the windows’ visible light transmittance—from the window manufacturer for inclusion in the calculations to demonstrate compliance. Buildings without this type of record wil

The daylight prescriptive path requires your team to track down information on VLT—the windows’ visible light transmittance—from the window manufacturer for inclusion in the calculations to demonstrate compliance. Buildings without this type of record will likely find it difficult or impossible to determine the VLT of the windows. If your project can’t identify that value for the windows, you cannot use this compliance path.