Using free lighting from the sun can help reduce your lighting costs.
This can be done by installing adjustable window blinds, shades, or reflective
film to admit light when you want it and yet control excessive daylight,
glare, and heat gain. You may have to combine this with rewiring and installation of
switches to enable you to turn off those lights that are nearest the windows.
To take best advantage of the natural light to supplement your artificial lighting. you can install daylight sensing controls that will automatically reduce the artificial lighting levels when there is sufficient natural light available. An installation of new, dimming electronic ballasts and the appropriate daylight sensing controls can maintain the ideal balance between artificial lighting and daylight and maximize your energy dollar savings.
In top floor spaces (one-story building, or a top floor), cutting new holes in the roof and installing high efficiency skylights may actually be cost effective.
