F17T8 FULL SPECTRUM FLUORESCENT TUBE 36,000 HOURS - 91 CRI HIGH COLOR RENDERING 5000 KELVIN - Extended life phosphors keep Spectra Brite full spectrum lamps brighter longer, and the 5 year average lifespan is up to 5 times longer than standard lamps. Spectra Brite fluorescent lamps are also Enviro-Lume certified and offer superior crisp white light with a fresh outdoor feeling. The balanced white light provides more accurate color rendition, reduced eyestrain, and less glare. Used in retail stores, offices, schools, and homes nationwide, Spectra Brite lamps are the ultimate in color correcting, long life full spectrum fluorescents! Replace 4 standard fluorescents with just 2 Spectra Brite 90 lamps to reduce watts per fixture while still enjoying brighter light output for tremendous energy savings!