The 30 Watt tungsten-halogen lamp used in the ASB-W-030 has a nominal color temperature of 3100 K and an average life of 400 hours at this temperature. The color temperature of the lamp is directly proportional to the lamp current which may be varied ± 25% with a control knob on the power supply. Over this range, both illumination and average life will change by approximately ± 50%. The optics of the ASB-W-030, in combination with the 30 Watt lamp, provide maximum illumination for monochromators. Higher power lamps have larger filaments, but no greater brightness per unit area. A filament larger than the 30 Watt size would simply overfill the entrance slit. The power supply provided with the ASB-W-030 is a DC current regulated power supply. Current regulation optimizes color temperature stability. Feature Value Lamp: Type: Tungsten-halogen Filament size: 1mm x 4mm Power input: 30 Watts (nominal) Light Output: 800 lumens (nominal) Current: 2.75 amp (nominal) Color Temperature: 3100°K Average Life: 400 hours (nominal) Spectral distribution: near blackbody Mount: Tapered flange, adjustable, Post mounting for standalone operation Housing: Air cooled with focusable fused silica doublet collection lens, f/1.9 collection and f/3.9 output. (lamp cross section) Power Input: 115 VAC, 50/60 Hz, 1 amp (standard) 220 VAC, 50/60 Hz, 0.5 amp (optional) Power Output: Type: constant current DC Range: 2.0 amp to 3.5 amp Regulation: 0.05% Warranty: One year Options: Spare lamp ASB-W-030B AF Series for remote fiber optic illumination.