The curing light
Spectrum & power
LCU emission spectrum and total radiant power to ISO/ANSI standards, 360–540 nm: the full physical description of the light itself, not a single number.
Products / MARC Light Collector
The laboratory reference for characterizing curing lights .
The MARC Light Collector resolves both halves of a cure: what a dental curing light emits, and what actually reaches the material. It measures absolute radiant power by wavelength across the violet and blue band, and, with a specimen in the sample compartment, the energy transmitted to the top and bottom of a composite or ceramic. It is the NIST-referenced laboratory instrument that handheld radiometers are benchmarked against, used in peer-reviewed dental research.
- 360–540 nmSpectrally resolved, violet through blue
- NIST-traceableCalibration, 300–1050 nm
- ISO 10650-2Conformant geometry and reporting
- 200+Peer-reviewed publications on the MARC platform
What it is
The instrument for questions about the curing light itself.
The MARC Light Collector characterizes dental curing lights with laboratory accuracy. Where a chairside meter returns a single number, MARC-LC returns the full physical description of an emission: absolute radiant power resolved by wavelength, the radiant exitance reaching a surface, and the complete time history of an exposure cycle. It answers the question the rest of the platform builds on: what is this light actually emitting? And with a material specimen in the sample compartment, it answers the other half: how much of that energy actually reaches the top and bottom of the restoration.
It is the de-facto laboratory reference for the field. Reviewers in Dental Materials, Operative Dentistry, and the Journal of Esthetic and Restorative Dentistry increasingly expect a new study to benchmark against a MARC-class instrument, and roughly 200 papers reference the MARC mark. The research name "MARC-LC" is retained for citation continuity, so new data stay commensurable with that corpus.
Measuring both the light and the energy through the material on a single instrument means the two halves of a cure live in one commensurable dataset, not stitched together from two tools.
What it measures
The light, and the energy that reaches the material.
Two measurements from one instrument: the curing light's own output, and, with a specimen in the sample compartment, the energy actually transmitted to the top and bottom of a composite or ceramic.
Energy through the material
Top & bottom
Top and bottom cosine-corrected sensors measure the irradiance and radiant exposure transmitted through a composite or ceramic specimen: what the bottom of the restoration actually receives.
Spectral radiant power
mW/nm
Per-wavelength emission: peak wavelengths, bandwidth, and the violet:blue ratio polywave lights require.
Radiant exposure
J/cm²
Delivered energy over the full exposure cycle: the dose a material is actually validated against.
Specimen control
1 · 2 · 3 mm
Delrin rings hold 10 mm composite specimens at 1, 2, and 3 mm thickness; nine apertures (3–11 mm) and a composite-tooth clinical proxy vary distance and area.
Calibration
NIST-referenced
Traceable to a national standard via an Ocean Optics USB4000 spectrometer; ISO 10650-2 conformant geometry and reporting, exported as an immutable open dataset.
How it measures
Total-flux geometry, to the ISO standard.
A planar, cosine-only sensor sees only what falls on its face. MARC-LC collects the total radiant flux: the geometry ISO 10650-2 specifies and the reason the method is accepted as gold standard.
01
Curing-light tip
Turbo and wide tips fit the 16 mm port
02
Integrating sphere
Total-flux collection, cosine-corrected
03
Ocean Optics spectrometer
Resolved by wavelength, 360–540 nm
04
Immutable dataset
mW/nm · mW/cm² · J/cm²
ISO 10650-2 conformant geometry and reporting · open formats (CSV · Excel · PDF)
Why the spectrum matters
Not all curing lights are the same light.
A 2026 study characterized eight contemporary multi-peak ("polywave") curing lights on an integrating-sphere spectroradiometer, and found they are not interchangeable. Their blue-to-violet power ratios ranged from 3:1 to 30:1, and the authors concluded that general conclusions about "multi-peak" lights as a class are not warranted.
The same work measured how far that light travels through a composite. Violet light, the band that activates TPO and Ivocerin photoinitiators, was attenuated almost completely with depth: reduced ~98–99% through 4 mm, far more than the blue band. A multi-peak light may simply not deliver violet energy to the bottom of a bulk-fill increment.
These are precisely the two questions MARC-LC resolves on one instrument: a light's spectral output by wavelength, and the energy actually transmitted to the top and bottom of the material.
Why the reference matters
Handheld radiometers were wrong by 7% to 535%.
When 16 handheld dental radiometers were measured against the MARC reference across 38 curing lights, their error ranged from 7% to 535%. Only one meter averaged under 20% error. A chairside number is not a measurement of the light; it is a measurement of that meter, and the spread between meters is enormous.
That is the entire case for a traceable, spectrally resolved reference. It is why MARC-class instruments are the ground truth that handheld meters and camera beam-profilers are calibrated against.
What it's for
From a single baseline to a service-life endurance run.
The same instrument answers a formulation question on a manufacturer's bench and a method-validation question in an academic lab.
Study
What it resolves
LCU baseline characterization
Radiant power, exitance, and emission spectrum over 360–540 nm.
Endurance / battery drain
Output vs. cycle index across a run: budget units have dropped a mean ≥20% (max 96%).
Tip damage & barrier impact
Change in exitance vs. a clean reference; barriers alone cost 4–6%.
Camera beam-profiler calibration
Spectral radiant power to convert camera pixels into absolute irradiance.
Headlight / loupe spectral leak
Premature-polymerization risk from operatory lighting, 360–800 nm.
Radiometer / chairside-meter validation
Gold-standard reference for handheld meters and field instruments.
Material & ceramic transmission
Transmitted irradiance by wavelength for formulation and IFU work.
The evidence
Studies that reached for the Light Collector.
Peer-reviewed work that used the MARC Light Collector: to characterize a light, profile a beam, or measure transmission through a material. Cited by author, journal, and year.
Beam profiling of curing lights: the MARC Light Collector's 16 mm spectral radiant-power measurement calibrated camera-based beam profilers to absolute irradiance.
Rocha, Maucoski, Roulet & Price, European Journal of Dentistry, 2022
Characterizing dental-headlight spectra: the MARC® Light Collector measured emission from 360–800 nm to quantify the premature-polymerization risk operatory lighting poses to composites.
Rocha, Ottenga, Zoidis, Pontes, Reis & Oliveira, J Clinical & Experimental Dentistry, 2022
Through the material: transmitted irradiance through lithium-disilicate ceramics, measured by wavelength: the cementation use case for the top-and-bottom ports.
Lencioni et al., J Esthetic & Restorative Dentistry, 2025
As the laboratory integrating-sphere reference, it exposed handheld dental radiometer error of 7%–535% across 16 meters and 38 curing lights.
Shortall, Hadis & Palin, PLOS ONE, 2021
The MARC family
Instruments for one curing step.
Every Bluelight instrument measures the same clinical step, the cure, at a different altitude. MARC-LC is the research reference at the top of that stack.
One curing step
measured at three altitudes
In the clinic
CheckMARC
Expert field audit of every light
for Dentists & DSOs
On the lab bench
MARC-LC
The light, and energy through materials
for Researchers & academic labs
In the classroom
MARC-PS
The operator's technique
for Dental schools
Manufacturers engage across all three: field data, events, and research
Put the laboratory reference on your bench.
MARC-LC is sold as a quoted instrument with research-team support and a documented uncertainty budget: source, drift, linearity, and stray light. Tell us about the work and we'll scope an instrument, onboarding, and the study design around it.