Test and Calibration

Light Source Testing Services
Goniometric Testing of Light Sources
Flat Panel Display Testing Services
Light Meter Test & Calibration
Retroreflective Material Testing Services
Night Vision Compatibility Testing
LED Grow Light Testing
Thin Film Measurement Services

Gamma Scientific is ISO/IEC 17025 accredited by NVLAP (NVLAP lab code 200823-0). In addition to assurance of measurement accuracy, accreditation ensures traceability to known standards, provides international acceptance of measured values, and is important for compliance purposes for your own ISO/IEC certifications.  Our state-of-the-art, ISO 17025 accredited calibration laboratories in San Diego, California offer a range of test and calibration services including:


  • Light Meter Test and Calibration
  • Lamp Standard Testing
  • Flat Panel Display Testing 
  • Night Vision Equipment Testing
  • Grow Lamp Testing -- PAR / PPFD 
  • Retroreflectance Testing to DOT / ASTM standards
  • Energy Star Testing
  • Near Eye Display Test Including AR / VR and HUD
  • Lamp Testing -- Total Spectral Flux Density & Color
  • Goniometric Power Distribution Testing


ISO 17025 is the main standard used by testing and calibration laboratories. While similar to the ISO 9000 (9001, 9002) standards, ISO 17025 adds the concept of competence to the equation and it applies directly to those organizations that produce testing and calibration results.  Laboratories use ISO 17025 to implement a quality system aimed at improving their ability to consistently produce valid results. Since the standard is about competence, accreditation is simply a formal recognition of a demonstration of that competence.  A prerequisite for a laboratory to become accredited is to have a documented quality management system.  Regular internal audits are employed to ensure continuous improvement.


There are two main sections in ISO/IEC 17025 - Management Requirements and Technical Requirements. Management requirements are primarily related to the operation and effectiveness of the quality management system within the laboratory. Technical requirements address the competence of staff, methodology, test/calibration equipment and the test methods. Full validation of test methods and proof of proficiency set this standard apart from ISO 9001 or 9002.



NVLAP is the National Voluntary Laboratory Accreditation Program. It is a National Institute of Standards and Technology (NIST) program in the USA which provides an unbiased third-party test and evaluation program to accredit laboratories in their respective fields to the ISO 17025 standard. NVLAP is in compliance with ISO 17011.









The EPA requires that all ENERGY STAR™ products must be certified by a third-party to ensure consumer confidence in the ENERGY STAR program and label. Product testing must be carried out in an EPA-recognized laboratory that has been verified to meet strict, international standards for quality and competency. Ongoing tests are also required to ensure that products continue to deliver superior energy efficiency and performance. 

Devices carrying the ENERGY STAR service mark generally use 20%-30% less energy than required by federal standards. The ENERGY STAR program was created by the US Department of Energy and US Environmental Protection Agency in 1992 to assist consumers in finding energy efficient products. Please also see www.energystar.gov.


LM-79 Procedures and Conditions

IES LM-79 is an approved method for testing electrical and photometric measurements of solid-state lighting products. LM-79 contains procedures for performing reproducible measurements of LEDs properties, including: total flux, electrical power, efficacy and chromaticity.  The scope of LM-79 applies to LED products that incorporate control electronics and heat sinks. This covers complete LED luminaires and integrated LED sources. It does not include bare LED chips or LED based products without a light source. LM-79 testing requires complete luminaire testing on an absolute photometric basis. Typically lighting products are evaluated on a relative photometric basis, where separate tests are done for lamps an luminaires. However, for solid state lighting products the LED lamps typically cannot be separated from their luminaires. The absolute photometric testing required measures the light distribution and light intensity of the complete luminaire.

LM-79 Test Procedures and Conditions

Testing conditions require an ambient temperature at 25 degrees  +/-1 degree C within 1 meter of the device under test.  Thermal transfer and airflow must be controlled, along with power supply conditions including AC waveshape and voltage regulation. Where appropriate, seasoning and test orientation must also be specified.  Integrating sphere systems are used to measure the total luminous flux and color, which can be performed with a photometer or spectroradiometer.  Goniophotometer systems are also used to measure luminous intensity distribution.

LM-79 Test Outputs and Calculations

  • Total Luminous Flux
  • Luminous Intensity Distribution
  • Electrical Power
  • Luminous Efficacy
  • Chromaticity
  • CCT
  • CRI

LM-80 Procedures and Conditions

IES LM-80-08 is an approved method for measuring lumen depreciation and maintenance of Solid State Lighting (LED) light sources, arrays and modules. The Illuminating Engineering Society (IES) developed the standard to provide an objective method to evaluate and compare LED components from different manufacturers.

It is important to understand that LM-80 is an approved method for testing LED components, and does not cover the measurement of luminaires. LM-80 reports document how LED components perform over a set period of time under specific conditions, and are not a measure of reliability. The standard also does not define or provide methods for estimation of expected life or lumen output beyond the test data.

LED Lifetime and Lumen Maintenance

Life testing for LEDs is different than lamp-based light sources because LED failure characteristics from those of lamps. Lumen maintenance is the percentage of initial lumens that a light source maintains over a defined period of time. LM-80 measures the depreciation of lumens over a specific timeframe to determine the useful life of LED components. 

LM-80 Test Procedures and Conditions

Test condtitions specify ambient temperature and airflow conditions. Other test parameters include device case temperature, operating orientation and spacing between adjacent devices.  Electrical drive consitions must also be precisely specified and maintained. measured and maintained. Test instrumentation and their operating parameters must be well controlled and documented.

LM-80 Test Reports

  • Description of sources tested
  • Ambient conditions (Airflow, temp, RH, etc.)
  • Case Test point temperature
  • Electrical conditions
  • Lumen maintenance date
  • Observation of failures
  • LED monitoring interval
  • Chromaticity shift over time

Calibration Accreditation - Enter lab code 200823 here to view our ISOIEC 17025 / NVLAP Accreditation Certificate and Scope on the NIST website.


Accreditation Scope - Calibration

Accreditation Certificate - Calibration



Energy Efficient Lighting Accreditation - Enter lab code 200823 here to view our Energy Efficient Lighting Products Scope and Certificate on the NIST website.


Accreditation Scope - Energy Efficient Lighting

Accreditation Certificate - Energy Efficient Lighting




Gamma Scientific is ISO/IEC 17025 accredited by NVLAP (NVLAP lab code 200823-0), ensuring fully traceable and highly precise calibration, to ensure that you remain in compliance with your own...
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The Gamma Scientific RoadVista® business unit is an industry leader in retroreflection and automotive and roadway lighting measurements. Measurements of all types of materials are performed on our world-class 15-meter photometric range in accordance with ASTM, CEN, ANSI, DIN, ISO, SAE, and many other specifications. We have the capability to measure retroreflection, nighttime color chromaticity, spectral reflectance, effective intensity, luminous intensity, and many others. Please contact us for more information.
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