Vector Plasma, Plasma One, Genus Spectra, Spectra Compact Replacement Double Bulb Replacement Bulbs For Vectra Plasma & Plasma One Replacement Bulbs For Genus Spectra, Spectra Compact The Vector Plasma One and the Genus Spectra Compact requires just one set of these bulbs 36watts - 16" x 1.5" x 0.9" - 4 Pin Bulbs should be changed every 6 months for optimal effectiveness