Optronic Laboratories OL 345 Multifunctional Standard Lamp

Overview

The Optronic Laboratories OL 345 Multifunctional Standard Lamp is a NIST-traceable, laboratory-grade radiometric and photometric reference source engineered for high-stability calibration of spectroradiometers, illuminance meters, luminance meters, radiometers, and spectral irradiance sensors. Operating on the principle of calibrated thermal radiation from a stabilized tungsten-halogen filament, the OL 345 delivers traceable spectral irradiance and spectral radiance outputs across two distinct optical configurations—enabling dual-mode metrological use without sacrificing accuracy or repeatability. Its design adheres to fundamental principles outlined in CIE Publication No. 69, ISO/CIE 13822, and ASTM E308, supporting compliance-driven workflows in optical metrology laboratories, display testing facilities, and regulatory validation environments.

Key Features

• Two-in-one calibration architecture: switch between spectral irradiance standard (250–2500 nm, bare lamp) and spectral radiance/luminance standard (350–1100 nm, with removable opal diffuser)
• Stabilized 45 W tungsten-halogen lamp operated at precisely controlled current (6.500 A), ensuring thermal equilibrium and minimized spectral drift
• Integrated forced-air cooling system maintains stable junction temperature during extended operation, critical for maintaining ≤±1% output stability over 50 hours
• Modular filter mount accepts standard interference, bandpass, and color-matching filters to tailor spectral output for detector spectral responsivity matching
• Cylindrical aluminum housing with precision-machined optical port and alignment fiducials ensures mechanical reproducibility during instrument intercomparison
• NIST-traceable calibration certificates available for spectral irradiance (250–2500 nm), spectral radiance (350–1100 nm), illuminance, luminance, and correlated color temperature (CCT)

Sample Compatibility & Compliance

The OL 345 supports calibration of a broad range of optical measurement devices including handheld and benchtop spectroradiometers (e.g., Ocean Insight QE Pro, Konica Minolta CS-2000), imaging colorimeters (e.g., Radiant Vision Systems TT-100), integrating sphere-based systems, and photopic/ scotopic radiometers. Its output uniformity—15.5 cm² active area with <±0.5% spatial nonuniformity when fitted with the opal diffuser—meets requirements for luminance standard use per CIE S 023/E:2019. Radiometric accuracy (±2% at 650 nm, ±4% at 250 nm) and photometric accuracy (±1%) are validated against NIST SRM 2020 and maintained through rigorous factory recalibration protocols aligned with ISO/IEC 17025:2017 accredited practices. The lamp is suitable for GLP/GMP-regulated photobiological safety testing (IEC 62471), LED lighting certification (IES LM-79), and display luminance verification per VESA DisplayHDR and ISO 9241-307.

Software & Data Management

While the OL 345 operates as a passive, hardware-based standard, its calibration data is delivered in machine-readable formats—including ASCII-based spectral tables (.csv) and XML-compliant metadata conforming to the CIE 183-2009 spectral data exchange standard. Each unit ships with a unique serial-numbered certificate containing full spectral irradiance and radiance datasets sampled at ≤1 nm intervals, uncertainty budgets per wavelength, and traceability statements linking to NIST’s primary standards. Optional integration with Optronic’s OL-Win software enables automated spectral comparison, deviation mapping against user-defined reference curves, and audit-ready reporting compliant with FDA 21 CFR Part 11 requirements for electronic records and signatures.

Applications

• Primary calibration of field-deployable UV-VIS-NIR spectroradiometers used in environmental monitoring and solar irradiance studies
• Reference source for validating spectral responsivity of CCD/CMOS-based imaging radiometers in automotive HUD and AR/VR display testing
• Traceable luminance standard for calibrating telephoto luminance meters in outdoor lighting and roadway visibility assessments
• Spectral irradiance reference for validating UV curing lamp output in medical device manufacturing and semiconductor photolithography processes
• Benchmark source in interlaboratory comparisons organized under ILAC MRA signatory frameworks

FAQ

What calibration options are available for the OL 345?
Three certified calibration packages are offered: OL 345R (spectral irradiance + spectral radiance), OL 345P (illuminance, luminance, and CCT), and OL 345RP (full suite). All calibrations are performed in accordance with ISO/IEC 17025 and include NIST-traceable uncertainty budgets.
Can the OL 345 be used for UV-A and UV-B radiometric calibration?
Yes—the bare-lamp configuration covers 250–2500 nm, enabling traceable calibration down to 250 nm. Radiometric uncertainty increases to ±4% at 250 nm due to quartz envelope transmission limits and detector quantum efficiency roll-off; users should confirm spectral responsivity match with their UV sensor.
Is the opal diffuser included with every OL 345 unit?
Yes—the removable opal diffuser is supplied as standard equipment and is required to establish the 15.5 cm² uniform radiance field. Its transmission profile is characterized and included in the calibration certificate.
How often should the OL 345 be recalibrated?
Optronic Laboratories recommends annual recalibration for routine metrology applications. For ISO/IEC 17025-accredited labs, recalibration interval must be justified by stability monitoring data; the lamp’s documented 50-hour stability supports extended verification cycles when supported by in-house drift tracking.
Does the OL 345 require external power regulation?
Yes—a stable, low-noise DC current source capable of delivering 6.500 A ±0.005 A is required. Optronic provides compatible current regulators (e.g., OL-2000 Series) with ripple <0.01% RMS to ensure optimal spectral stability and minimize calibration uncertainty contributions from power supply variation.