ISO 17025 Accredited Calibration Laboratory

reflectance measurement

The Gamma Scientific laboratory is accredited to ISO/IEC 17025:2005 by the National Voluntary Laboratory Accreditation Program (NVLAP Lab Code 200823-0) to perform calibrations in the field of Optical Radiation Measurements.

Our Laboratory has also been awarded accreditation by NVLAP under the Energy Efficient Lighting Products Program. This includes LM-79 accreditation for Solid State Lighting Luminaires (LEDs), and LM-80 accreditation for measuring lumen depreciation and maintenance of SSL arrays, modules and light sources.

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About the Calibration Laboratories Accreditation Program
According to NIST, “The Calibration Laboratories Accreditation Program was established in response to a request from the National Conference of Standards Laboratories (NCSL). Under the Calibration Laboratories LAP, laboratories are accredited to perform calibrations, at specified ranges and uncertainties, in one or more of the eight fields of calibration covering in excess of eighty parameters. To become accredited, laboratories must meet the requirements set forth in NIST Handbook 150, NVLAP Procedures and General Requirements. The NIST Handbook 150-2 handbook series for calibration laboratories was developed to assist laboratories in achieving accreditation by providing guidelines for good calibration laboratory practices.”

Gamma Scientific Scope of Accreditation to ISO/IEC 17025:2005

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Calibration Services

Solid-State Lighting (LED)

  • High Resolution Goniometric Measurements
  • Total Power Output using our 2 meter sphere
  • Spectroradiometric Measurements
  • Low Uncertainty (~1%) Photometric Measurements
  • Output Efficiency (Lumens/Watt)
  • Lumen Depreciation Testing
  • Specific Environmental Testing Conditions

Photometric and Radiometric Measurements

  • Lumens
  • Lux (lumens/m²)
  • Footcandles (lumens/ft²)
  • Candelas (lumens/steradian)
  • Candela/m² (nit)
  • Footlamberts (1/pi*candela/ft²)
  • Watts
  • Watt/cm²
  • Watt/cm²/sr

Display Measurements (Flat Panel, LED, Plasma, Projection and CRT)

  • Color and chromaticity
  • Luminance
  • Viewing-angle color and luminance
  • Polarization

Spectral Radiometric Measurements (covering 200 nanometers to 1.8 micrometers)

  • Watts/nm
  • Watt/cm²/nm
  • Watt/cm²/sr/nm

Night-vision Measurements

  • ANVIS Radiance (AR) per MIL-STD-3009 and MIL-L-85762A down to 10-12 AR
  • Spectral radiometric measurements down to 10-16 watts/cm²/nm

Retroreflection Measurements

  • RoadVista, a Gamma Scientific company, offers an extensive range of retroreflective testing services in our 15-meter photometric range that exceed the specifications of ASTM E810. Our calibrations meet the specifications of various test methods, including ASTM, SAE, ITE, ITS, CEN and many others.

Reflection Measurements

  • Spectral reflection and diffuse reflection measurements available down to 0.01% reflection

Transmission Measurements

  • Spectral transmission measurements available down to 0.0001% transmission

Goniometric Measurements

  • Full goniometric classification of lamps and reflectors down to 0.002 degree repeatability

Filter Design

  • Extensive filter fit and design capabilities for photometric, radiometric and tristimulus filter designs for CCD, CMOS, and silicon detectors

Gamma Scientific Scope of Accreditation to ISO/IEC 17025:2005

Calibration and Measurement Capabilities (CMC) 1,2
Measured Parameter
or Device Calibrated
Range Uncertainty (k=2)3,5 Remarks and References
Electromagnetics-DC/Low Frequency
DC Resistance and Current (20/E05)
Current 100 nA to 1 µA
1 µA to 10 µA
10 µA to 100 µA
100 µA to 10mA
10 mA to 100 mA
100 mA to 1 A
DC Voltage (20/E06)
Voltage 100 mV to 1 V
1 V to 10 V
10 V to 900 V
Optical Radiation
Photometric (20/O02)
Illuminance 0.001 lux to 0.1 lux
0.1 lux < to 10 000 lux
See Note 8
Illuminance Responsivity 0.001 mV/lux to 1 mV/lux
0.001 V/ lux to 10 V/ lux
Luminance 0.001 cd/m2 to 1 cd/m2
1 cd/m2 to 10 000 cd/m2
Luminance Responsivity 1 µv/cd/m2 to 1 mV/cd/m2
1 mv/cd/m2 to 10 V/cd/m2
Luminance Intensity 0.001 cd to 0.1 cd
0.1 cd to 10 000 cd
Total Luminous Flux 0.01 lm to 10 lm
10 lm to 10 000 lm
10 000 lm to 100 000 lm
Nominal for lamp type 0.0008
Dimensionless quantity
Correlated Color Temperature 2600 K to 3150 K 7 K Based off 1000W FEL Irradiance
Standard Uncertainty of Spectral
Profile in Photometric Region
Color Rendering Index (CRI) Nominal for lamp type 1.2 % Dimensionless quantity
Radiometric (20/O03)
Total Spectral Radiant Flux 220 nm
250 nm
350 nm
450 nm
555 nm
654.6 nm
900 nm
1100 nm
Reported in mw/nm
for wavelength
shown in range
Spectral Irradiance
(1000 W FEL Lamp)
220 nm
250 nm
350 nm
450 nm
555 nm
654.6 nm
900 nm
1100 nm
2000 nm
2300 nm
2400 nm
Reported in mW/cm2nm
for wavelength
shown in range
Spectral Irradiance
(Tungsten Source with
Integrating Cavity)
300 nm to 400 nm
400 nm to 930 nm
930 nm to 1200 nm
Reported in mW/cm2nm
for wavelength
shown in range
Spectral Radiance
(Tungsten Source with
Integrating Cavity)
300 nm to 400 nm
400 nm to 930 nm
930 nm to 1200 nm
Reported in mW/cm2sr
for wavelength
shown in range
Spectral Radiance
(Radiometric Detectors)
200 nm – 1800 nm Various: See Full
Scope for Details
Reported in volts or
amps per watt format for
wavelength show in range


Note 1: A Calibration and Measurement Capability (CMC) is a description of the best result of a calibration or measurement (result
with the smallest uncertainty of measurement) that is available to the laboratory’s customers under normal conditions, when
performing more or less routine calibrations of nearly ideal measurement standards or instruments. The CMC is described in the
laboratory’s scope of accreditation by: the measurement parameter/device being calibrated, the measurement range, the uncertainty
associated with that range (see note 3), and remarks on additional parameters, if applicable.

Note 2: Calibration and Measurement Capabilities are traceable to the national measurement standards of the U.S. or to the national
measurement standards of other countries and are thus traceable to the internationally accepted representation of the appropriate SI
(Système International) unit.

Note 3: The uncertainty associated with a measurement in a CMC is an expanded uncertainty using a coverage factor, k = 2, with a
level of confidence of approximately 95 %. Units for the measurand and its uncertainty are to match. Exceptions to this occur when
marketplace practice employs mixed units, such as when the artifact to be measured is labeled in non-SI units and the uncertainty is
given in SI units (Example: 5 lb weight with uncertainty given in mg).

Note 3a: The uncertainty of a specific calibration by the laboratory may be greater than the uncertainty in the CMC due to the
condition and behavior of the customer’s device and specific circumstances of the calibration. The uncertainties quoted do not
include possible effects on the calibrated device of transportation, long term stability, or intended use.

Note 3b: As the CMC represents the best measurement results achievable under normal conditions, the accredited calibration
colaboratory shall not report smaller uncertainty of measurement than that given in a CMC for calibrations or measurements
vered by that CMC.

Note 3c: As described in Note 1, CMCs cover calibrations and measurements that are available to the laboratory’s customers
under normal conditions. However, the laboratory may have the capability to offer special tests, employing special conditions,
which yield calibration or measurement results with lower uncertainties. Such special tests are not covered by the CMCs and are
outside the laboratory’s scope of accreditation. In this case, NVLAP requirements for the labeling, on calibration reports, of
results outside the laboratory’s scope of accreditation apply. These requirements are set out in Annex A.1.h. of NIST Handbook
150, Procedures and General Requirements.

Note 4: Uncertainties associated with field service calibration may be greater as they incorporate on-site environmental contributions,
transportation effects, or other factors that affect the measurements. (This note applies only if marked in the body of the scope.)

Note 5: Values listed with percent (%) are percent of reading or generated value unless otherwise noted.

Note 6: NVLAP accreditation is the formal recognition of specific calibration capabilities. Neither NVLAP nor NIST guarantee the
accuracy of individual calibrations made by accredited laboratories.

Note 7: See NIST Handbook 150 for further explanation of these notes.

Note 8: All photometric parameters are for halogen or incandescent sources operating at a nominal color temperature of 2856 K.

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