Emerson said ‘To the illumined mind, the world burns and sparkles with light’. Unfortunately, he meant metaphorically. Use task lighting to target work and leisure activities. This lets you reduce your overall room lighting levels, think quality, not quantity of light.
Use energy-efficient compact fluorescent bulbs especially in fixtures that operate more than two hours a day. They cost more initially but use 75 percent less electricity while lasting about ten times longer than incandescent bulbs.
Open shades and blinds to take advantage of natural light, the sun is right there for many hours a day, and doesn’t cost a thing.
Select bulbs carefully. Look for the highest lumens at the lowest wattage. Wattage is the power needed to make a bulb work. Lumens measure brightness. Long-life bulbs emit less light than standard incandescent bulbs of the same wattage. Use long-life bulbs only in hard-to-reach places.
Keep light fixtures clean to gain the most illumination.