Labsphere AUX Absorption Calibration Lamp

Overview

The Labsphere AUX Absorption Calibration Lamp is an engineered reference light source designed specifically to correct self-absorption errors in photometric and radiometric measurements conducted within integrating spheres. When measuring solid-state lighting (SSL) devices—such as LEDs, OLEDs, or complete luminaires—their physical geometry, surface reflectance, and spectral emission profile often differ significantly from those of standard reference lamps. These discrepancies cause non-uniform photon absorption within the sphere cavity, leading to systematic underestimation of total luminous flux or radiant power. The AUX lamp addresses this by enabling a two-step measurement protocol: first, a baseline sphere response is recorded with only the AUX lamp illuminated; second, the test device is measured with both the AUX lamp and the device active. The differential signal allows precise quantification and removal of self-absorption bias per IES LM-79, CIE 127, and ISO/CIE 19999-compliant methodologies.

Key Features

• Optimized spectral output for stable, repeatable calibration across visible and near-UV/NIR ranges (380–1050 nm), matching typical SSL emission profiles.
• Integrated 1-inch flange mounting ensures mechanical and optical alignment repeatability without user adjustment—critical for GLP-compliant workflows.
• Three current-rated variants (AUX-35, AUX-50, AUX-100) provide scalable irradiance levels to match diverse sphere sizes (e.g., 0.3 m to 2.0 m diameter) and detector saturation thresholds.
• Direct compatibility with Labsphere’s programmable DC power supplies enables automated current ramping and stability monitoring during calibration sequences.
• Designed for seamless integration into LightMtrx® software: lamp identification, current logging, and absorption correction coefficients are auto-populated upon detection via USB or RS-232 handshake.
• Traceable calibration documentation available upon request, supporting ISO/IEC 17025-accredited laboratory requirements.

Sample Compatibility & Compliance

The AUX lamp supports measurement of all common SSL form factors—including bare emitters, COBs, SMD packages, downlights, troffers, and automotive headlamps—regardless of size, thermal mass, or beam angle. Its low-thermal-load design minimizes sphere wall temperature drift during extended calibration routines. All AUX models comply with ANSI C78.377 (chromaticity tolerances), IEC 62612 (LED lamp safety), and are validated for use in FDA-regulated photobiological safety testing (IEC 62471) when paired with Labsphere’s spectroradiometric systems. Data integrity meets 21 CFR Part 11 audit-trail requirements when used with LightMtrx® in electronic record mode.

Software & Data Management

LightMtrx® v5.2+ natively recognizes AUX lamp models and applies pre-characterized absorption correction algorithms based on sphere geometry, coating reflectance (e.g., Spectralon®, BaSO₄), and lamp current. Correction coefficients are stored in encrypted project files with timestamped metadata, including operator ID, ambient temperature/humidity, and sphere history. Raw and corrected datasets export to CSV, XML, or ASTM E2721-compliant .rad formats. Batch processing supports multi-lamp calibration campaigns with automatic outlier rejection and uncertainty propagation per GUM (JCGM 100:2008).

Applications

• High-accuracy total luminous flux (lm) and radiant power (W) measurement per IES LM-79-19 and EN 13032-4.
• Colorimetric validation of LED bins in manufacturing QC, including chromaticity shift under thermal load.
• Calibration of sphere-based goniophotometers and imaging colorimeters.
• Photobiological safety classification (RG0–RG3) per IEC 62471 and ANSI RP-27.3.
• Development of NIST-traceable transfer standards for national metrology institutes.
• Validation of spectral correction models in computational sphere simulations (e.g., Monte Carlo ray tracing).

FAQ

How does the AUX lamp differ from a standard incandescent reference lamp?
Unlike broadband tungsten-halogen references, the AUX lamp is spectrally and geometrically optimized for SSL-specific self-absorption correction—not absolute intensity calibration.
Can AUX lamps be used in spheres coated with materials other than Spectralon®?
Yes—LightMtrx® includes correction libraries for BaSO₄, PTFE, and custom coatings; empirical characterization data is required for non-standard surfaces.
Is lamp replacement required after a specific number of operating hours?
Lifespan is rated at ≥2,000 hours at nominal current; output stability is monitored via integrated photodiode feedback in compatible power supplies.
Does AUX support automated compliance reporting for ISO 17025 audits?
Yes—LightMtrx® generates audit-ready reports with full traceability: lamp serial number, calibration date, sphere ID, environmental logs, and uncertainty budgets.
Are AUX-35 and AUX-100 electrically interchangeable in the same socket?
Mechanically identical, but current ratings differ; using an AUX-100 in a circuit configured for AUX-35 may trigger overcurrent protection—always verify power supply settings prior to installation.