How is radiometric calibration performed and what does traceability mean in this context?

Radiometric calibration is typically performed by comparing the output of a test lamp to a primary or secondary standard using spectroradiometers and calibrated detectors under controlled geometry and operating conditions. Traceability means the measurement chain can be linked through documented calibrations and uncertainty analyses back to a national metrology institute, ensuring that the reported spectral irradiance or radiance values are quantitatively comparable across laboratories.

What are the main types of radiometrically calibrated light sources and how do they differ?

Common types include calibrated quartz tungsten halogen (QTH) lamps for broadband visible–NIR irradiance, deuterium lamps for UV, and integrating-sphere-based sources for uniform radiance or luminance. QTH lamps provide smooth spectra with good stability in the visible–NIR, deuterium lamps offer strong UV emission but lower output in the visible, while sphere sources are used when spatial uniformity and well-defined aperture geometry are critical, for example in camera and detector calibration.

What key specifications should I consider when selecting a radiometrically calibrated light source?

Key specifications include spectral range and interval of calibration, spectral irradiance or radiance levels at the working distance, calibration uncertainty, and lamp stability (drift and noise) over time. You should also check recommended operating current/voltage, maximum operating hours before recalibration, spatial uniformity, and the physical geometry (filament size, alignment marks, and mounting) relative to your measurement setup.

How can I compare different products in this category for my measurement setup?

Compare the provided calibration tables and certificates for wavelength coverage, spectral resolution, and expanded uncertainty (k-factor) across the wavelengths you care about most. Also evaluate whether the calibrated geometry (distance, aperture size, beam divergence, and alignment reference) and electrical requirements match your setup, and whether accessories such as current-stabilized power supplies, alignment jigs, and replacement lamps are available and compatible.

What factors influence lead time, customization options, and pricing for radiometrically calibrated light sources?

Lead time and price are driven by the base lamp type, the complexity of the calibration (spectral range, resolution, and uncertainty targets), and whether traceability to specific standards or custom geometries are required. Customization such as non-standard alignment fixtures, special housings, alternate working distances, or additional calibration points increases both calibration effort and cost, and may extend delivery by several weeks due to lab scheduling and soak/burn-in requirements.

How can I find, compare, and request quotes for radiometrically calibrated light sources on FindLight without creating an account?

On FindLight, navigate to Incoherent Light Sources → Lamps → Radiometrically Calibrated Light Sources, then use filters for spectral range, lamp type (QTH, deuterium, sphere), and calibration type (irradiance vs radiance) to narrow results. You can open product pages to compare calibration ranges and datasheets side by side, then use the on-page RFQ or contact form to send technical requirements and request quotes directly from suppliers without registration.

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Radiometrically Calibrated Light Sources

Radiometrically Calibrated Light Sources for Precision Testing

DH-3P and HL-3P Series Radiometric Calibrated Halogen Light Sources

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Sold by: Ocean Optics Ships from: United States

Specifications
Traceable Calibration Wavelength:	Cosine Corrector Fiber (standard): 210 - 1100nm, Cosine Corrector Fiber (extended): 210 - 2400nm, Cosine Corrector Fiber (standard): 230 - 1100nm, Cosine Corrector Fiber (extended): 230 - 2400nm, Cosine Corrector Fiber (standard): 350 - 1100nm, Cosine Corrector Fiber (extended): 350 - 2400nm, Bare Fiber (standard): 250 - 1100nm, Bare Fiber (extended): 350 - 1100nm, Bare Fiber (standard): 350 - 1100nm, Bare Fiber (extended): 350 - 2400nm
Light Source:	Deuterium & Tungsten Halogen, Tungsten Halogen
Calibration Lifetime:	50 hours
Drift (Voltage):	0.01 % per hour
Minimum Uncertainty Level:	3.7 %

Did You Know?

Radiometrically calibrated light sources are typically traceable to national metrology standards (e.g., NIST) and specify absolute spectral irradiance in units like W·m⁻²·nm⁻¹ at a defined distance and geometry, not just relative intensity. A common pitfall is using lamp datasheet curves directly in radiometric measurements without accounting for aging drift: quartz tungsten halogen standards can change by >1% per 100 hours, which is large compared to typical detector linearity errors. Proper use requires strict control of alignment, working distance (often 50 cm or 1 m), and operating current, as even a 0.1 A deviation can noticeably distort the calibrated spectral output. These sources are essential for calibrating spectroradiometers, integrating spheres, and imaging systems used in analytical and medical applications where absolute dose or radiance must be known.

Related Resources

Frequently Asked Questions

A radiometrically calibrated light source is a lamp whose spectral irradiance or radiance has been measured and traceably linked to a national or international metrology standard (e.g., NIST), with calibration data provided over a specified wavelength range. Unlike a standard lamp, it is supplied with a calibration certificate, tabulated spectral data, uncertainty budget, and defined operating conditions (current, geometry, distance) under which the calibration is valid.

Overview of Radiometrically Calibrated Light Sources

Radiometrically Calibrated Light Sources provide a traceable, quantified output of optical power or irradiance across a specified wavelength range. Unlike generic lamps, these sources are supplied with calibration data that links their spectral radiant flux, irradiance, or radiance to national metrology standards. This enables repeatable, absolute radiometric measurements in labs and production environments.

On FindLight, Radiometrically Calibrated Light Sources are typically based on quartz tungsten halogen or deuterium lamps, sometimes combined with integrating spheres or precision apertures. Each unit is delivered with a calibration certificate and data set defining output versus wavelength and operational conditions.

Typical Specifications and Performance Parameters

When evaluating Radiometrically Calibrated Light Sources, buyers typically compare:

Wavelength range: Commonly from the UV (e.g., 200–400 nm) through visible (400–700 nm) and into the NIR (up to ~2500 nm), depending on lamp type.
Calibration quantity: Spectral irradiance (W·m⁻²·nm⁻¹), spectral radiance (W·m⁻²·sr⁻¹·nm⁻¹), or spectral radiant flux.
Calibration uncertainty: Stated as a percentage or expanded uncertainty over the specified wavelengths.
Output stability: Temporal drift, warm-up time, and recommended operating current or voltage.
Geometry: Bare lamp, lamp with integrating sphere, or lamp plus precision aperture and defined working distance.
Lifetime and recalibration interval: Typical operating hours and recommended recalibration cycles for maintaining traceability.

Applications and Use Cases

Radiometrically Calibrated Light Sources are used for calibrating photodiodes, CCD/CMOS detectors, spectroradiometers, and imaging systems. Common applications include remote sensing instrument validation, optical power meter verification, material reflectance measurements, and QA of radiometric test setups in R&D and production test benches.

Buyer Guidance on FindLight

When sourcing Radiometrically Calibrated Light Sources on FindLight, compare the calibration wavelength range and quantity with your detector sensitivity and measurement geometry. Check uncertainty budgets, lamp type, and stability parameters to match your required measurement accuracy. Review the supplied calibration file format to ensure compatibility with your data acquisition and analysis tools.

For detailed pricing, availability, and custom options such as alternative apertures or extended wavelength coverage, you can request quotes directly from suppliers. No registration is required to contact vendors, enabling fast technical clarification and procurement of Radiometrically Calibrated Light Sources that fit your test and calibration workflow.