wo primary reasons and benefits for using daylighting are psychological and energy savings which can categories as health and well-being, energy efficiency and sustainable design.

Daylighting
Sunlight is the earth’s original source of light from the sun. Daylighting is the natural way of
practice by placing windows or other openings and reflective surfaces with the controlled
admission of the natural light into a building to provide internal lighting (ASHRAE, 2009).
Natural light is considered to be ‘clean’ light which is comprised not just of daylight apertures.
It is a major contributor of maintaining good health in which it can promote happiness,
contentment and create productive environment for building occupants (Alzubaidi, et al., 2013).
In terms of energy efficiency, daylighting can minimize the artificial light and reduce electricity
costs. It also lowers heating, ventilation, and air conditioning (HVAC) costs. For building
incorporate with daylighting, it is projected an overall energy conservation range from 15% to
40% (ASHRAE, 2009). As a result of globalization and rapid development, there has been a
growing numbers of infrastructural projects and construction of high-rise buildings. It has
brought about new fenestration system that is capable of achieving substantial energy
conversation for buildings. With proper integrated fenestration design, using daylighting in the
building is a key strategy for passive design. Base on National Fenestration Rating Council
(NFRC, 2005) and ASHARE (ASHRAE, 2009), two primary reasons and benefits for using
daylighting are psychological and energy savings which can categories as health and well-being,
energy efficiency and sustainable design.