Specifications include, but are not limited to: Trojan, Model No. 302-509 or First Light Technologies, Model No. 2940 3.2.1 Storage Low pressure amalgam design: The coiled filamentary cathodes to be heated by the arc current. The lamp shall be preheated to promote longevity. 3.2.2 The filament shall be of the clamped design, significantly rugged to withstand shock and vibration. 3.2.3 Electrical connections at one end. 3.2.4 Each connection shall have four (4) pins. 3.2.5 Minimum UV output 125 watts at 253.7 nm after 100-hour burn in, measured in an integrating sphere; 250-watt output. 3.2.6 Rated to produce 0 levels of ozone. 3.2.7 Lamp bases shall be of a ceramic construction with a glazed finish resistant to UV and ozone. The base shall be stepped internally and bridged externally to provide additional electrical isolation between the electrodes. 3.2.8 The barrier shall be dielectrically tested for 2,500 volts. 3.2.9 1.47 m minimum arc length. 3.2.10 19 mm nominal outside diameter. 3.2.11 Four Teflon O-rings equally spaced to center the lamp within the quartz sleeve