Prev2 of 5Next Types of Energy-Efficient Lighting LED (Light Emitting Diode) bulbs and CFL (Compact Fluorescent Lamp) bulbs are the most energy-efficient options available. LEDs, in particular, use up to 90% less energy than traditional incandescent bulbs and last much longer. Prev2 of 5Next Types of Energy-Efficient Lighting Post navigation Using Renewable Energy Certificates (RECs) Installing Solar Water Heaters