Simulation is the only way to account during the design phase for daylight designs that have many variables such as the use of lightshelves and light-colored interior finishes. The Glazing Factor Calculation path (Option 1) takes into account only walls,

Simulation is the only way to account during the design phase for daylight designs that have many variables such as the use of lightshelves and light-colored interior finishes. The Glazing Factor Calculation path (Option 1) takes into account only walls, windows, floor and ceiling areas, and the measurement path (Option 3) will not help inform design as much.

Multifamily residential projects may find it difficult to meet the credit unless the units are supplied with fresh air.

Multifamily residential projects may find it difficult to meet the credit unless the units are supplied with fresh air. Typically multifamily projects are naturally ventilated, and they can meet the IEQp1 requirements with operable windows. However, the additional outside air required for IEQc2  compliance may be difficult to provide unless they also duct in extra outside air.