OL 245U 45-W Irradiance Standard (Seasoned)

The OL 245U is a 45-W Seasoned Irradiance Standard lamp. These lamps have tungsten coiled-coil filaments enclosed in a small quartz envelope.

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.