IES LM-83-12 was created to develop a new suite of metrics capable of describing multiple important dimensions of daylighting performance in an existing building and a new design, from concept through construction documents. The intent of these new climate-based metrics is to improve on the predictive performance of historical metrics, such as Daylight Factor and define a consistent calculation methodology that would allow for multiple design alternatives of proposed designs, daylit buildings, and/or climatic locations to be compared, in a consistent manner.