UVP 95-0249-01 Model UVS-28 EL Series Eight Watt UV Lamp, 254nm Wavelength, 115V Models available include 254nm shortwave, 365nm longwave or a combination shortwave/longwave version Basic configuration offers one UV and one white light tube -- the advantage of white light or UV illumination from one unit! Use white light when working with materials in a dimly-lit area. Twin models have two tubes of the same wavelength or the 2UVTM Models use two different wavelengths