What is MARC™-RC?
MARC™ stands for Managing Accurate Resin Curing.
There are two versions of this system, the RC (Resin Calibrator) and the PS (Patient Simulator)
The Resin Calibrator is a benchtop-style setup comprised of:
A securely-housed, custom laboratory-grade NIST-referenced spectroradiometer (spectrometer) attached via a birfurcated fibre optic cable to two energy sensors 
(simulates the top and the bottom of a standard ISO sized restoration.
This laboratory setup, designed with clinical relevance in mind, allows dental researchers and manufacturers to ask and answer: How much energy are you delivering to your resins? And how much energy does your resin require?
As with the PS, the Resin Calibrator's hardware is USB-connected to a very simple user interface (on a dedicated laptop computer) that most users are able to master in 20 minutes.
The Resin Calibrator allows a user to very quickly and easily acquire:
1. Simple quantification of light attenuation due to restorative material.
2. Simple quantification of spectral transmission due to restorative material.
3. Simple selective sampling of portions of the output spectrum (eliminating the need for external filters).
4. Accurate assessment of beam inhomogeneity (both irradiance and spectrum)
5. Quantification of energy absorbed by restorative material.
6. Quantification of light reaching depth of restorations when using bulk-fill technique.
7. Correlation of differing amounts of light energy delivery to other material properties.
8. Simple quantification of light output.
9. Simple quantification of attenuation due to distance (as referenced in data below).
10. Simple quantification of light attenuation due to infection control barriers.
11. Characterization of eye protection or other optical filters.
12. QC testing of curing lights used as tools in other studies/departments/offices.
One user had the following to say about the RC:
"I purchased and tested [on the Resin Calibrator] a powerful new LED curing light at the ADA [Las Vegas, October 2011]. This particular light delivers, at 1mm distance, a remarkable 8,000 mW/cm™ to a 4mm wide increment of resin. It is the most powerful curing light we have tested (at the tip of the light guide), and dentists would be attracted to it because of the claimed reduction in curing times. However, the irradiance delivered by this particular curing light drops rapidly to as little as 900 mW/cm² (≈-89%) at the clinically relevant distance of 8mm. "