What is the minimum daylight illuminance required for one credit?

The minimum daylight illuminance required for earning one credit in the Estidama Pearl Building Rating System is 250 lux for 50% of the occupied area. This standard emphasizes the importance of natural daylight in achieving sustainable building practices, as natural light can enhance occupant comfort, reduce energy usage, and improve overall well-being.

In this context, 250 lux is a significant threshold that reflects adequate light levels for various activities and contributes to the overall performance of the building. By requiring that this level of illuminance be achieved in 50% of the occupied spaces, the system encourages architects and builders to thoughtfully design areas to maximize natural light penetration and effectively utilize solar energy, enhancing the building's sustainability profile.

Other options present different levels of illuminance or coverage percentages that do not align with the established criteria for earning the credit based on the Estidama guidelines. The chosen requirement strikes a balance between practicality and the pursuit of increased daylight quality in occupied spaces, underscoring its relevance in sustainable building design.