OL 245A 45-W Irradiance Standard (250 – 750 nm)

The OL 245A is a 45-W Irradiance Standard lamp. These lamps have tungsten coiled-coil filaments enclosed in a small quartz envelope. The spectral irradiance calibration of this lamp covers the 250-750 nm wavelength range.

The Spectral Irradiance standards issued by Optronic Laboratories are based on the National Institute of Standards and Technology (NIST) Spectral Irradiance Scalefor the wavelength range of 250 to 2400 nm and on a blackbody for the wavelength range above 2400 nm. The NIST Scale has an uncertainty (k=2) of 0.63% in the visible, 1.56% in the ultraviolet at 250 nm, and 0.31% in the infrared at 2000 nm.