OL 345使用45W的鹵鎢燈，以及一個可拆卸的乳玻璃。

當加上乳玻璃時，形成15.5 cm²的均勻區域，可作為亮度、光譜輻亮度標準，校正范圍350-1100nm

去掉乳玻璃，則可以作為光譜輻射照度標準，光譜范圍250nm-2500nm

在鹵鎢燈與乳玻璃之間，可加入不同濾光片，形成不同色溫的白光光源，以及不同帶寬的單色光，進行校正。

TYPE OF CALIBRATION                                                       MODEL NO.
Uncalibrated ...........................................................................OL 345U
Spectral Irradiance (250-2500 nm)
& Spectral Radiance (350-1100 nm)........................................OL 345R
Illuminance, Luminance
& Color Temperature ................................................................OL 345P
All of the above ........................................................................ OL 345RP

SPECIFICATIONS
Spectral Irradiance @ 650 nm ............................... 0.6 DW/cm²nm (typical)
Spectral Radiance @ 650nm ........................... 0.45 DW/sr cm²nm (typical)
Illuminance @ 6.500 amps ................................................... 24 fc (typical)
Luminance @ 6.500 amps .................................................... 65 fL (typical)
Radiometric Accuracy ....................................................... ± 2% @ 650 nm
.......................................................................................... ± 4% @ 250 nm
Photometric Accuracy ......................................................................± 1½%
Stability ................................................................. 50 hrs. for ± 1% change
Lamp Power ........................................................... 45 watts (6.500 amps)
Diameter .................................................................................... 5½ inches