Sunwave® Full Spectrum Compact Fluorescent Light Bulb 20 Watt 120V The Sunwave® Full Spectrum CFL light bulbs are the most advance compact fluorescents on the market. The compact size fits most table lamps and wall fixtures. Light bulb life is rated at 10,000 hours compared to 750 hours for most standard light bulbs. Color temp. is 5500K producing a relaxing natural color full spectrum light. CRI or Color Rendering Index is 93, comparable to mid-day sun. Flicker-free, cathode x-ray radiation shielded, electronic ballast. Measures approx. 5 1/2" long. 20 Watt light output equivelent to 75 watt incandescent bulb. Sunwave® light bulbs can help you feel less fatigue and have better concentration. Treat yourself right with these healthy and safe lighting alternatives. These are for 120V AC systems not 12V DC systems.