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Technical Information


  • Provides a Soruce of Collimated, Uniform Irradiance
  • Illuminance Level Easily Adjusted


  • Characterization of Front-Surface Optics
  • Haze Measurements
  • Retro-Reflector Materials Tests
  • Reflectance and Transmittance Measurements
  • Automotive and Architectural Glass Measurement

The KI-125 Koehler Illuminator is designed for applications requiring uniform illuminance in the UV-VIS-NIR region of the spectrum. The Koehler Illuminator is a halogen lamp mounted in a lamp housing combined with a focusing optics assembly. The image of the halogen lamp filament is focused on a glass rod that evenly mixes the light distribution and directs the radiance through a fixed aperture before it passes through a baffled lens assembly and an adjustable iris diaphragm. The iris diaphragm controls the amount of illumination at the working plane. The KI-125 Koehler Illuminator features a 125 watt tungsten halogen lamp with a mounting boss attached to a 1/4-20 rod that slides into the sleeve of a sturdy 6 in. x 6 in. support base, allowing for height adjustment or alternate mounting. The KI-125 provides a maximum illuminance output of 20,000 lux at a normal working distance of 50 cm. Included is a 6 foot cable with a 2-pin male connector to operate with a power supply. A filter holder allows the placement of 1 inch diameter color balancing filters, narrow band filters or neutral density filters between the lamp and the glass rod. A lens cover protects the Koehler Illuminator when not in use.


Optical Filter Sets
NBFS Narrow Band Filter Set
Includes seven visible narrow band filters (0.4 m, 0.45 m, 0.5 n, 0.55 m 0.6 m, 0.65 m and 0.7 m)
CBFS Color Balancing Filter Set
Includes three color balancing filters (-120 mired blue light, +20 mired amber light and -165 mired blue light)
NDFS Neutral Density Filter Set
Includes six neutral density filters (optical density: 0.3, 0.6, 1.0, 1.3. 2.0 and 3.0)





125 Watt


19.0 Volts

Illuminance Output:

100 - 20,000 lux

Working Distance:

50 cm

Spot Size Diameter:

14 mm

Beam Half Angle:


Color Temp:

3000 K

Rated Lamp Life:

2650 hours


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