Products / MARC Light Collector
The MARC Light Collector resolves both halves of a cure: the dose a curing light delivers at the surface of a specimen, and the energy that passes through it. It measures absolute radiant power by wavelength from visible to infrared, and, with a specimen in the sample compartment, the transmitted energy at the bottom sensor. It is a NIST-traceable laboratory instrument, independently benchmarked against a laboratory integrating-sphere gold standard (adjusted R² above 0.99), and used in peer-reviewed dental research.
See it measure
The instrument and its software, measuring a real cure: the full spectrum from visible to infrared, dose set at the surface, transmittance read at the bottom sensor, the whole cycle recorded.
MARC-LC · the software measuring a cure · 30 s
Talk to the research teamWhat it is
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 a widely used laboratory reference for characterizing curing lights, with published work in journals from Dental Materials to the Journal of Esthetic and Restorative Dentistry. Roughly 200 papers reference the MARC mark across the platform, and 18 name the Light Collector itself in their methods. The research name "MARC-LC" is retained for citation continuity, so new data stay directly comparable with that published body of work.
Measuring both the light and the energy through the material on a single instrument means the two halves of a cure live in one directly comparable dataset, not stitched together from two tools.
What it measures
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.
LCU emission spectrum and total radiant power to ISO/ANSI standards across 350–1,000 nm: the full physical description of the light itself, not a single number. The 360–540 nm curing window is one view of a much wider instrument.
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.
Per-wavelength emission: peak wavelengths, bandwidth, and the violet:blue ratio polywave lights require.
Delivered energy over the full exposure cycle: the dose a material is actually validated against.
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.
The equipment is NIST traceable to the standard, via an Ocean Optics spectrometer; geometry and reporting consistent with the radiometric test methods in ISO 10650:2026, exported as an immutable open dataset.
How it measures
A planar, cosine-only sensor sees only what falls on its face. MARC-LC collects the total radiant flux: the collection geometry behind the radiometric test methods in ISO 10650:2026, and the reason integrating-sphere measurement is the accepted laboratory approach.
Turbo and wide tips fit the 16 mm port
Total-flux collection, cosine-corrected
Resolved by wavelength, 350–1,000 nm
mW/nm · mW/cm² · J/cm²
Measurement and reporting consistent with ISO 10650:2026 test methods · open formats (CSV · Excel · PDF)
Why the spectrum matters
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 a traceable reference matters
A peer-reviewed study in PLOS ONE compared 16 handheld dental radiometer models against a laboratory-grade integrating-sphere reference across 38 curing lights. Individual readings ranged from 7% to 535% of the reference value: underestimating output by as much as 93%, and overestimating it by as much as 435%. Only one meter model averaged within roughly 20% of the reference. 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 laboratory integrating-sphere instruments are the ground truth. In the same study, MARC-LC closely agreed with that reference: adjusted R² above 0.99, no significant difference in pooled mean power, and derived irradiance within about 0.8% of the reference. Its radiant-power measurements have also been used to convert camera images into absolute irradiance beam profiles.
What it's for
The same instrument answers a formulation question on a manufacturer's bench and a method-validation question in an academic lab.
The evidence
Every paper below names the MARC Light Collector in its own methods - verified against the primary text, not abstracts - and is grouped by what the instrument was used for. Each citation links to its DOI.
Generated the reference table of peak wavelength, power, and irradiance across halogen, plasma, LED, and laser curing lights for a field review of light in dentistry.
Hadis, Shortall & Palin · Biomater Investig Dent · 2024
doi.org/10.2340/biid.v11.40308
Its radiant-power measurements were used to convert camera images into absolute irradiance beam profiles (technical work with a Bluelight co-author).
Rocha, Oliveira, Felix, Roulet, Sinhoreti & Correr · Eur J Dent · 2022
doi.org/10.1055/s-0041-1731628
Characterized a four-wavelength curing light against a conventional unit on irradiance, spectrum, and composite properties - research from the USAF Postgraduate Dental School.
Adams, Savett, Lien, Raimondi & Vandewalle · J Clin Exp Dent · 2022
doi.org/10.4317/jced.59825
Measured dental-headlight spectra across 360–800 nm, showing that blue-light emission from headlights can prematurely polymerize light-cured composites and shorten working time.
Rocha, Ottenga, Zoidis, Pontes, Reis & Oliveira · J Clin Exp Dent · 2022
doi.org/10.4317/jced.59628
Rapid curing of bulk-fills: real-time transmission at 2 and 4 mm on both sensors, violet and blue analyzed separately, on the MARC accessory bench.
Marović, Par, Daničić et al. · Int J Mol Sci · 2025
doi.org/10.3390/ijms26062803
Two cosine-corrected sensors read top and bottom irradiance through graphene-modified orthodontic retainer adhesives during cure.
Liu, El-Angbawi, Ji, Rosa & Silikas · Eur J Oral Sci · 2024
doi.org/10.1111/eos.12966
Blue vs red transmission through lithium-disilicate ceramic: three translucencies, three shades, six thicknesses - red penetrates significantly better.
Lencioni, Lamoutte, Pereira, Rocha & Oliveira · J Esthet Restor Dent · 2026
doi.org/10.1111/jerd.70171
Light attenuation through surface-treated CAD-CAM lithium-silicate glass ceramics, specimens centered on the bottom sensor.
Al-Johani, Haider, Silikas & Satterthwaite · Dental Materials · 2023
doi.org/10.1016/j.dental.2023.07.004
Transmitted irradiance through repeatedly fired fully crystallized lithium-silicate ceramics.
Al-Johani, Haider, Silikas & Satterthwaite · J Prosthet Dent · 2024
doi.org/10.1016/j.prosdent.2024.01.006
Per-millimetre light transmittance and ISO 4049 depth of cure of a bulk-fill under the exposure-reciprocity law at an equalized 20 J/cm².
Rocha, Roulet, Sinhoreti, Correr & Oliveira · Braz Dent J · 2021
doi.org/10.1590/0103-6440202103842
Irradiance transmittance of clear PVS injection-moulding materials from 2 to 10 mm thickness.
Machado, Rocha, Oliveira, Reardon, Martins & Lawson · J Esthet Restor Dent · 2025
doi.org/10.1111/jerd.13270
Verified 3-second high-irradiance curing protocols to within ±10%, sampling 360–540 nm at 16 records per second, before degree-of-conversion testing.
Algamaiah, Alshabib, Algomaiah, Yang & Watts · Dental Materials · 2024
doi.org/10.1016/j.dental.2024.08.008
Characterized the curing units behind rapid-cure and ageing work on translucency-shift bulk-fill composites.
Marović, Par, Mandic et al. · Materials · 2025
doi.org/10.3390/ma18245613
Verified radiant emittance before every specimen in hygroscopic testing of nano-ZnO resin composites.
Alayed, Silikas & Watts · Eur J Oral Sci · 2025
doi.org/10.1111/eos.70029
Verified emittance for hydrolytic-degradation testing of giomer and fluoride-releasing bulk-fill composites.
Aldhafyan, Khan, Saeed, Al-Odayni et al. · ACS Omega · 2025
doi.org/10.1021/acsomega.5c00784
Top-sensor verification behind flexural, roughness, sorption, and colour-stability testing of commercial bulk-fills.
Almulhim, Alghamdi, Alqahtani et al. · Dentistry Journal · 2026
doi.org/10.3390/dj14020117
Verified radiant emittance in colour-stability and hardness work under GERD-like acid conditions.
AlQahtani · Saudi Dental Journal · 2025
doi.org/10.1007/s44445-025-00095-y
Independently benchmarked against a Labsphere integrating-sphere gold standard - University of Birmingham, no Bluelight author: adjusted R² above 0.99, no significant difference in pooled mean power, derived irradiance within ~0.8% of the reference.
Shortall, Hadis & Palin · PLOS ONE · 2021
doi.org/10.1371/journal.pone.0245830
Plus a ConsEuro 2021 conference abstract (Üçtaşlı et al., University of Turku & University of Eastern Finland). Counts cover journal papers whose methods explicitly name the Light Collector; 200+ peer-reviewed publications involve the wider MARC platform. Browse the full research index →
The MARC family
Every Bluelight product measures the same clinical step, the cure, at a different altitude. MARC-LC is the research reference at the top of that stack.
Expert field audit of every light
for Dentists & DSOs
The light, and energy through materials
for Academic researchers & manufacturers
The operator's technique
for Dental schools
Running a MARC Resin Calibrator?
Your RC upgrades to the MARC-LCMARC-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.
