Windows to admit light into the space

  WINDOWS TO ADMIT LIGHT INTO THE          SPACE 

´Windows are the most common way to admit daylight into a space. Their vertical orientation means that they selectively admit sunlight and diffuse daylight at different times of the day and year.

´There are three ways to improve the amount of light available from a window

´(a) placing the window close to a light. colored wall

´(b) slanting the sides of window openings so the inner opening is larger than the outer opening.

´(c) using a large light colored window-sill to project light into the room.

´Different types and grades of glass and different window treatments can also affect the amount of light transmission through the windows. The type of glazing is an important issue, expressed by its VT coefficient (Visual Transmittance).

´Coefficient measures how much visible light is admitted by the window. A low VT (below 0.4) can reduce by half or more the light coming into a room. But be also aware of high VT glass: high VT numbers (say, above 0.60) can be a cause of glare. On the other hand, you should also take into account the undesirable effects of large windows.