Get short and long-wave ultraviolet light at the touch of a button. Two separate tubes (254 and 365 nm) operate independently-no wavelength mixing occurs. Snap-on filter frame simplifies filter replacement. Filter measures 6 inch x 1-3/4 inch and provides high-intensity fluorescence for a minimum of 5000 hours. Wavelength rocker switch is conveniently located for index-finger operation. Housing is constructed of lightweight Cycolac   plastic. Lamp includes a 7-ft, two-wire cord (115 VAC 0981800 has a plug). order optional lamp stand 09818-50 separately. Product may contain trace amounts of mercury; cautions should be used in breakage, cleanup, shipping and/or disposal.