CL2 Spectral Irradiance Standard
The CL2 is a universal spectral irradiance standard lamp for the calibration of spectroradiometers, lux meters and radiometers. Its mounting bracket is compatible with all optical table and mounting systems. Calibration distance is measured from a simple datum face plate.
The calibration is performed with respect to National Physical Laboratory (NPL Teddington UK) calibrated lamps held by Bentham. Alternatively, direct NPL calibration can be offered.
|TYPICAL PHOTOMETRIC VALUES FOR CL2 (100W Quartz Halogen Lamp)
||Spectral irradiance at 0.5m distance from datum face
||250-3000nm, 5nm intervals
|Peak spectral irradiance
||30mW/m2.nm at 800nm
|Chromaticity coordinates, CIE 1931 & 1976
||x = 0.425, y = 0.400
u' = 0.245, v' = 0.520
|Correlated colour temperature
The CL2 is usually supplied with a 100W quartz halogen lamp. It requires a precision constant current dc power supply at 8.5A.
The CL2 can be supplied with alternative lamps ranging from 10W to 250W. It can also be supplied with spectral radiant intensity calibration, mW/(sr.nm).
Bentham offers 2 variants of a 250W rated constant current p.s.u. for use with calibration lamps, models 605 and 608. The latter includes a current ramping facility for lamp switch on and off.
Plane of Measurement
||10,50 and 250W lamps available
||UV extension 250-300nm
IR extension 800-3000nm
||Calibration at 200mm from datum face
||CL2_RI Radiant Intensity Standard
Calibration performed at one metre distance from plane of filament to provide calibration in radiant intensity (mW.sr-1.nm-1 )
CL2_2856K Illuminant A
Calibration performed at reduced lamp current to obtain a CCT of 2856K, illuminance in lux reported