The Eco-Friendly A19 halogen bulbs are compliant with the Energy Independence and Security Act, which means they are up to 30 percent more efficient than current standards. Bulbs are fully dimmable and can last up to 1,000 hours. They are available in four wattages equivalent to 40-, 60-, 75-, and 100-watt incandescents. Cost: $8 to $10 (2-pack). Bulbrite. 800-528-5555.