Never depend on a single source of light for a space, use a variety of light sources and have the ability to balance them to suit the needs at the time. Poorly located task lighting on workstations causes glare — which makes the task harder to see. Making the light more intense only increases the glare which makes vision even worse!

We perceive light that reflects off surfaces. Color and texture on these surfaces impact greatly on the amount and quality of lighting. Consider lighting when you select colors and textures. New lamp designs offer excellent lighting solutions to specific lighting problems. Halogen and fluorescent lamps are compact, low maintenance and have excellent light and color qualities.

Selecting well engineered fixtures will reward you with great performance. Fixtures should be selected for what they will do to the light and the space as well as for style.
If you have to see the light source of a fixture, make sure it is soft so as not to detract your attention from more important features.