Please contact the technical staff before shipping instruments or standards to the address listed below.
National Institute of Standards and Technology
100 Bureau Drive, Stop 8442
Gaithersburg, MD 20899-8442
|Service ID Number||Description of Services||Fee ($)|
|37010C||Luminous Intensity and Color Temperature Standard Lamps||4635|
|37020S||Special Tests for Luminous Intensity and Color Temperature of Submitted Lamps||At Cost|
|37030C||Color Temperature Standard Lamps||3799|
|37040C||Each Additional Color Temperature for 37030C||626|
|37050S||Special Tests for Color Temperature of Submitted Lamps||At Cost|
|37060S||Special Tests for Total Luminous Flux of Submitted Incandescent Lamps and Fluorescent Lamps||At Cost|
|37070C||Opal Glass Luminance Coefficient Standards||3243|
|37080S||Special Tests for Submitted Luminance Sources and Transmitting Diffusers||At Cost|
|37090S||Special Tests for Photometers, Illuminance Meters and Luminance Meters||At Cost|
|37091S||Special Test for Submitted Illuminance Head or Illuminance Meter for Illuminance Responsivity||At Cost|
|37092S||Special Test for Submitted Luminance Head or Luminance Meter for Luminance Responsivity|
|37100S||Special Photometric Tests||At Cost|
|37110S||Special Tests for Submitted Flashing-Light Photometers||At Cost|
|37130S||Special Tests for Luminous Intensity and Luminous Flux of LEDs||At Cost|
|37131S||Special Test for Submitted LED for Luminous and/or Radiant Intensity and Color (Optional)ddafd||At Cost|
Special Test for Submitted LED for Total Luminous Flux and/or Total Rdiant Flux and Color (Optional)
|37140C||NIST Issued New Incandescent Standard Lamps for Total Spectral Radiant Flux||8500|
|37150S||Special Test for Submitted Incandescent Lamps for Total Spectral Radiant Flux||At Cost|
Fees are subject to change without notice.
Calibration services in this area provide access to the photometric scales that are realized and maintained at NIST. Lamp standards of luminous intensity, luminous flux, and color temperature, as well as reference photometers and materials as described below, are issued or calibrated on a routine basis.
This laboratory's quality system is based on the ANSI/NCSL Z540-1-1994 standard and the ISO/IEC Guide 25.
NIST will issue to the customer 1000 W modified FEL quartz halogen lamps calibrated for luminous intensity (candela) and color temperature (kelvin). These lamps have a double coil filament and a clear bulb, and are potted on a medium bipost base. The lamps are operated at approximately 7 A/85 V dc, at a color temperature of 2856 K. The relative expanded uncertainty of the luminous intensity of these lamps is 0.6 % and the expanded uncertainty of the color temperature is 8 K at 2856 K.
NIST will calibrate the luminous intensity and color temperature of incandescent lamps with a medium bipost base submitted by customers. The inside frosted lamps, the airway beacon lamps, and the 1000 W FEL lamps previously issued by NIST can be submitted for recalibration. Customers can specify either the lamp current or the color temperature of the lamp (normally 2856 K) for calibration. The uncertainty of calibration is described above.
NIST will issue to the customer 1000 W modified FEL quartz halogen lamps as described in 37010C calibrated for color temperature. The lamps are usually calibrated for a color temperature of 2856 K. The expanded uncertainty of the color temperature of these lamps is 8 K at 2856 K.
The color temperature standard lamps issued for 37030C can be calibrated for additional color temperature points in a range from 2000 K to 3200 K. The expanded uncertainty of this calibration is 4 K to 11 K in the range from 2000 K to 3200 K.
NIST will calibrate the color temperature of incandescent lamps with a medium bipost base submitted by customers. The inside frosted lamps, the airway beacon lamps, and the 1000 W FEL lamps previously issued by NIST can be submitted for recalibration.
NIST will calibrate the total luminous flux (lumen) of incandescent lamps and fluorescent lamps submitted by customers. The standard lamps previously issued by NIST can be submitted for recalibration. Miniature lamps may also be accepted. Customers should contact NIST before submitting lamps. The relative expanded uncertainty of this calibration is typically 1.0 % for incandescent lamps and 2.0 % for fluorescent lamps, which depend upon the reproducibility of test lamps.
NIST will issue flashed opal glass plates, 51 mm x 51 mm, calibrated for luminance coefficient (ratio of luminance/illuminance, unit: sr-1) for International Commission on Illumination (CIE) Illuminant A (2856 K source). The glass plates, masked with a circular aperture 25 mm in diameter, are calibrated for the luminance within a circular area of 1 cm in diameter in the center of the aperture. The relative expanded uncertainty of this calibration is 0.8 %.
NIST will calibrate luminance (cd/m2) of submitted sources or the luminance coefficient (sr-1) of submitted transmitting diffusers, including opal glass previously issued by NIST. Customers should contact NIST before sending sources or diffusers. The relative expanded uncertainty of luminance calibration is 0.8 %.
NIST is capable of calibrating photometers, illuminance meters, and luminance meters submitted by customers. Calibration is normally performed using a CIE Illuminant A source (2856 K incandescent source).
NIST will calibrate illuminance photometers and illuminance meters submitted by customers for illuminance responsivities. Calibration is performed at illuminance levels from 0.1 lx to 3000 lx. Calibrations at higher illuminance levels (up to 100 klx) are also available under special arrangements. The relative expanded calibration uncertainty (k = 2) is typically 0.5 %, which may increase at low illuminance levels close to 0.1 lx or high illuminance levels close to 100 klx. As an option, NIST can also measure the spectral responsivity of a submitted illuminance photometer and calculate the spectral mismatch correction factor for a source with a known spectral power distribution.
NIST will calibrate luminance photometers and luminance meters submitted by customers for luminance responsivities. Calibration is performed at luminance levels from 0.1 cd/m2 to 8000 cd/m2. The relative expanded calibration uncertainty (k = 2) is typically 0.7 %, which may increase at low luminance levels close to 0.1 cd/m2.
NIST can provide special tests for sources, detectors, and photometric instruments other than those stated above under limited conditions by special arrangements with NIST. Customers should contact NIST for consultation.
NIST will calibrate submitted flashing-light photometers to measure integrated illuminance [lx . s] or effective intensity [cd]. Calibration is normally performed with white light (~6500 K) from a xenon strobe light in the range of 1 lx . s to 100 lx . s and with red light using an Aviation Red filter. The relative expanded uncertainty of calibration is ~1 % or larger depending on the performance of the instrument under test.
NIST is capable of calibrating various light emitting diodes (LEDs) submitted by customers including low-power, mid-power, and high-power LED packages, LED arrays or modules, LED light engines, LED lamps, following measurement standards such as IES 79 and CIE S 025 for measurement of LED lamps and LED luminaires, IES 85, CIE 225:2017, and CIE 226-2017 for measurement of high-power LED packages at a specified junction temperature, and CIE 127:2007 for measurement of low power LED packages.
NIST can calibrate submitted LEDs for Averaged LED Intensity under the CIE Standard Conditions A and B (defined in CIE 127:2007), true luminous/radiant intensity as defined in CIE 225:2017, and color characteristics. The relative expanded uncertainty (k = 2) for an intensity calibration varies from 0.5 % to 2 % depending on the test LED, and less than 0.001 in chromaticity for a color characteristic calibration.
NIST will calibrate submitted LEDs for total luminous flux (lm), total radiant flux (W), and color characteristics using the detector-based 2.5 m absolute integrating sphere. The relative expanded uncertainty (k = 2) for a total flux calibration varies from 0.5 % to 1.5 % depending on the test LED, and less than 0.001 in chromaticity for a color characteristic calibration.
NIST issues 2.85 A, 75 W quartz tungsten halogen (QTH) standard lamps with a miniature E10 screw base; an E10 to E26 screw base converter is also supplied to the customer. A standard lamp is calibrated for (1) total spectral radiant flux (W/nm) in the spectral range from 300 nm to 1100 nm with uncertainties from 1 % to 3 % depending on the wavelength, (2) total luminous flux (lm), and (3) correlated color temperature (CCT) (K).
NIST also calibrates customer-submitted incandescent lamps. A submitted lamp will be calibrated for (1) total spectral radiant flux (W/nm), (2) total luminous flux (lm), and (3) correlated color temperature (CCT) (K). Contact Yuqin Zong (email@example.com) for pricing and artifact compatibility with the NIST calibration facility.
NIST Measurement Services: Photometric Calibrations, Y. Ohno, Natl. Inst. Stand. Technol. Spec. Publ. 250-37 (1997).
Improved Photometric Standards and Calibration Procedures at NIST, Y. Ohno, J. Res. Natl. Inst. Stand. Technol., 102(3), 323-331 (1997).
The Detector-based Candela Scale and Related Photometric Calibration Procedures at NIST, Y. Ohno, C. L. Cromer, J. E. Hardis, and G. Eppeldauer, J. IES, 23 (1), 89-98 (1994).
National Institute of Standards and Technology detector-based photometric scale, C. L. Cromer, G. Eppeldauer, J. E. Hardis, T. C. Larason, and A. C. Parr, Applied Optics, 32 (16), 2936-2948 (1993).