The 66295 QTH Research Source comes complete with all the necessary components to begin work. It includes a lamp housing for QTH lamps, an OPS-Q1000, your choice of a 600 or 1000 W QTH lamp (specify at time of order) and all necessary cables and mounting hardware. The lamp housing provides the proper environment for the lamp. A rear reflector collects the lamp's back radiation and focuses it near the lamp filament, for collection and collimation by the condensing lens assembly. External lamp and reflector adjustments let you position the filament and its image for maximum output. The OPS-Q1000 is a constant current and constant power source for 600 and 1000 W QTH lamps. It has excellent stability and smart features. Preset and monitor the lamp's current, voltage, wattage and operating hours from the power supply's front panel or remotely via a PC. Lamps can be easily interchangeable with the appropriate socket adapter. This 2 Inch Series version has a F/1 Two Element Fused Silica Condenser.