Through history; a large body of research has found a relationship between the IEQ and the recovery of patients in healthcare facilities. IEQ factors include natural ventilation, daylighting, acoustics, materials off gassing, etc... This research is to identify the guidelines to healthy daylighting in hospital buildings. Research methods include grounded theory finding through intensive literature review and analysis of successful international examples. Following comes the theory testing to assess daylight quality in a regionally acclaimed self funded "The Children Oncology Hospital" - locally known as 57357 - the study is expected to shed the light on the architectural design principles for daylighting as well as the thorough investigation of the case study building.