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Technical Information


  • Measure Luminous Flux of Fiber Illuminators
  • Measure Collimated Sources
  • Inspection of Borescopes and Endoscopes
  • Quality Control Inspection of Miniature Lamps and LEDs

The FIMS-400P Fiberoptic Illuminator Photometer is an easy-to-use, precision light-measuring instrument designed for use in the field, laboratory or production floor. The instrument measures luminous flux from sources such as fiber illuminators, borescopes, endoscopes, and miniature lamps.

The FIMS-400P consists of a compact, lightweight pistol grip handle with a built-in microprocessor that performs several functions at the touch of a button. The instrument features a photopically filtered silicon detector to provide maximum sensitivity at low light levels. A 4 inch diameter integrating sphere collects the total light power which enters through the measurement port. The sphere is coated with Labsphere's highly Lambertian, diffuse white reflectance coating, Duraflect. Duraflect is the ideal coating for spheres that are exposed to harsh environments as it is waterproof and extremely durable.

The FIMS-400P is powered by two 9V batteries and is calibrated to read in lumens. Simple push button controls are easily accessible and clearly labeled on the front panel. Sensitivity over four full decades provides the capability of measuring from 0.1 to 9,999 lumens. Data is instantly displayed on an easy-to-read 4.5 digit front panel display.

A calibration certificate with calibration traceable to NIST is provided with each instrument. Yearly calibration is recommended to ensure accurate performance.




Measurement Units:


Measurement Range:

0.1 - 9,999 lumens


0.1 lumens from 0.1 to 99.9 lumens


1 lumen from 100 to 9,999 lumens

Range Selection:


Integrating Sphere:

4 inch diameter

Sphere Coating:


Measurement Port Diameter:

16 mm


Photopically filtered silicon photodiode


9V alkaline battery (2)


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