Sciencetech offers 200W lamps as standards of spectral irradiance, illuminance and color temperature. These lamps have tungsten coiled-filaments enclosed in a small quartz envelope. Calibration of the 200W lamps over 250 to 2500 nm wavelength range is available with high-accuracy level. The high-accuracy standards of spectral irradiance issued have a transfer uncertainty relative to the NIST Scale of ±063% in visible, ±1.56% in the ultraviolet and ±0.31% in the infrared at 2000nm. Illuminance and color temperature values are also supplied with this standard calibrated over the visible spectrum. Price includes lamp and lamp holder. Power supply sold separately.