Day lights

Research Paper

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Day light: The use of controlled natural lighting methods indoors through skylights, windows, and reflected light..

Day lighting in a building: is utilizing the available sunlight by manipulating window placement, window fixtures, and room dimensions to maximize natural light in a space.

Benefits:
It minimizes the need for lamps and overhead lights and the energy required to power artificial lighting.
Daylighting improves performance and health in office workstations and schools, as well as sales in retail stores.
Creates indirect sunlight that reduces the glare of conventional windows

Main Day Light Sources / Tools:

Skylights:
Skylights are rooftop windows which bring in twice the light of a traditional window of the same size. Skylights eliminate the need for electric lighting during the day.
They’re mostly installed on the north side of the roof to reduce the heat gained from the sun.

Sun Tunnels:
A sun tunnel uses a small dome skylight on the roof and another on the ceiling of a room. A flexible tube, similar to a clothes-dryer vent, connects both domes. Also called a “sun tube, light bounces around the inside of this tube, creating a bright skylight inside.

Mirrors:
Well-placed mirrors can be used to reflect the light, doubling the amount of ambient light in a room. You can use bulbs of half the normal wattage, or half the number of fixtures, with no loss in light level. The potential energy savings is enormous (50% in this simple example).
The typical mirror is a sheet of flat plate glass coated with aluminum or silver on one side. The opposite side is a highly reflective surface. Because the coating is on the backside, it’s protected from scratching and will typically last a very long time.

Light Shelves:
Light shelves are horizontal fins located above eye level at the windows to bounce the light back up onto the ceiling. This diffuses the light and brings it deeper into the building. Well-placed light shelves also act as a shading
*Both light and shelve must be white, or a bright hue.