ULTRA-VIOLET PRODUCTS U90-0012-01 PEN-RAY LAMP WITH PS-1 PEN RAY POWER SUPPLY is an ultraviolet light source for science and industrial applications. Pen-Ray Lamps are low pressure, cold cathode UV lamps made of double bore quartz tubing. This design allows the electrodes to be positioned at one end of the lamp providing easy access into small apertures. Depending on the lamp characteristics, primarily the lighted length, the power requirement to the lamp can range from 2 to 20 watts and produce from 40 uW/cm² to over 20 mW/cm².