The document discusses three main options for energy-efficient lighting: fluorescent lights, compact fluorescent lights (CFLs), and light-emitting diode (LED) lights. Fluorescent lights last much longer than incandescent bulbs and use less energy. CFLs are smaller than fluorescent tubes and can fit in standard light fixtures. LED lights have the longest lifespan, use the least amount of energy, and don't contain mercury like fluorescent bulbs. However, LEDs currently have higher upfront costs and produce lower quality light than other options.