Daylighting as an Alternative to Artificial Lighting
What is Daylighting?
Daylighting involves using natural, outdoor light to illuminate the interior spaces of a building evenly by means of proper window placements and orientations, skylights, clerestories,and other methods.
How does Daylighting reduce energy consumption?
Transparent or translucent window glass having three main performance characteristics that affect energy use:
U-value, which determines conductive heat losses and gains; 
visible light transmission, which determines the relative amount of light that will enter a space;  and
solar heat gain coefficient, which determines the relative amount of solar gain .
Historically, windows were single glazed, but today, there are a number of options for window glazing. Double or triple glazed windows create more insulation, making a structure more energy efficient by reducing heat loss through the windows . High-performance glazing also uses a double pane glass unit with a high insulation rating using vacuum that will admit more light and less heat than a typical window .
Detail of High Performance Glazing. 
Devices that Redirect Sunlight:
Devices that redirect light such as light tubes, reflectors, and light shelves bring light into parts of a building that would otherwise be too deep of an interior or obscured from sunlight by interior walls.
Distribution of Sun Rays using a Light Tube. 
Thoughtful Use of Exterior Elements:
The careful placement of windows and shading allows in more light when it is desirable and less when it is not.
Windows: For example, if a house is designed with a large number of windows facing south those windows will let the low winter sun into the home to warm it .
Shading: Awnings can be utilized to shade these same windows from letting in excess sun during the summer when the additional heat is not desired. Because the sun is higher in the sky in the summer months the awnings prevent the rays coming from a steeper angle from reaching the windows .
How can Daylighting work in North Texas?
Currently, the need for the use of artificial lighting indoors during the day is pervasive in residential buildings in North Texas. This is unnecessary even in existing homes with the availability of sunlight redirection devices. Moreover, Texas has a great deal of sun throughout the year, approximately 61%, and this can dramatically affect the temperature of a building .