Daylight has a positive effect on people. Researchers have shown that people work more efficiently in buildings with daylight. Besides, using daylight in buildings reduces energy costs. In a well-designed building; energy consumption decreases at the rate of 50% - 80%.
Daylight design is made through creating a balance between heat gain and loss, glare control and daylight variances. Shading mechanisms, shining apparatus, courtyards, atriums and permeability of glass are also taken in consideration. Building facades, window sizes and apertures, glass selection, reflectivity of indoors, locations of interior walls are the other issues to be considered.

LEED Conformity Criteria

In 75% of LEED Credit EQ 8.1 living spaces approximately 2% daylight must be provided. This means; lighting higher that 200 lux must be provided.

Methodology

Daylight simulation can be done through a specific computer modeling. Lighting intensity in indoors is determined by means of illumination curves. Then this illumination curves are placed in architectural interior plans.
Then this illumination curves are placed in architectural interior plans.

Floor areas are under 3 categories;
1. Living spaces receiving daylight (areas receiving daylight 250 or more lux)
2. Living spaces not receiving daylight (areas receiving daylight less than 250 lux)
3. No-regularly occupied spaces.