ISFH CalTeC – Reference lamps

ISFH CalTeC offers calibration of standard light sources, with a focus on 250 W tungsten-halogen lamps.

Our calibration procedure

At ISFH CalTeC, light sources are calibrated using the substitution method, which includes the following steps:

1. Precise positioning

• The halogen lamp to be calibrated is positioned 300 mm in front of the sensor head of a spectroradiometer.
• Positioning is performed using a precision micrometer screw between the sensor and the lamp’s reference plane.

2. Optical axis alignment

• A bidirectional laser ensures that the lamp filament and the detector are perfectly aligned on the optical axis.
• The alignment is performed perpendicular to the detector’s input surface.

3. Optimized measurement conditions

• Minimization of stray light effects
• Quantification and control of all measurement uncertainty contributions
• Use of a specially developed low-uncertainty measurement procedure

Traceability and applications

Calibrations are performed using a fully characterized precision spectroradiometer.

We deliver high-precision reference light sources for:

• Calibration of spectroradiometers
• Research and development
• Lighting technology and photometry
• Quality assurance in photovoltaics