🎯 Objective:

To determine and validate the Correlated Color Temperature (CCT) of a standard lamp with high precision, ensuring its conformity to reference values for use in lighting measurements, color quality assessments, or instrument calibration.

🛠 Required Apparatus:

• Standard Lamp (e.g., Quartz Halogen, calibrated tungsten filament source)
• High-Resolution Spectroradiometer
• Temperature-Stabilized Integrating Sphere (optional for uniformity)
• Regulated Power Supply (low ripple, voltage- and current-controlled)
• Reference Data for spectral calibration (NIST-traceable preferred)

🔬 Calibration Workflow:

1. Lamp Stabilization

Allow the lamp to warm up under nominal operating conditions for at least 20–30 minutes, ensuring thermal equilibrium for consistent output.

2. Spectral Acquisition

Capture the Spectral Power Distribution (SPD) using a calibrated spectroradiometer under controlled ambient conditions.

3. Chromaticity and CCT Derivation

Derive chromaticity coordinates (x, y) and calculate the CCT using methods like Robertson’s algorithm or McCamy’s formula, depending on the precision required.

4. Comparison with Standard

Compare calculated CCT with the certified reference values. Consider measurement tolerances and environmental factors.

5. Adjustment (if needed)

Tweak lamp power input or apply correction curves if deviations exceed acceptable limits.

6. Documentation

Record:

• Measured data and CCT values
• Instrument IDs and calibration dates
• Environmental conditions and operator details

Issue a traceable calibration certificate if applicable.

🧠 Best Practices:

• Calibrate your spectroradiometer regularly with traceable standards
• Perform measurements in a dark room with stable temperature
• Use consistent geometry and alignment procedures

📞 Contact Us:

For more details, calibration services, or consultation:

📧 Email: info@itcindia.org
📞 Call: +91 9316473033