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Lamp Testing GENERAL LIGHT MEASUREMENT

Total luminous flux is the spatially integrated, photopically weighted, total light output from a lamp. Total luminous flux is the most important parameter for non-directional, general lighting products.

For directional lamps, such as reflector lamps, intensity and beam angle are the most important parameters. The lamp total luminous flux divided by the lamp electrical power is the luminous efficacy (lm/W) of a lamp.

The most common method for measuring the total luminous flux of lamps is using an integrating sphere photometer employing V (lambda) corrected photometer or spectrometer. The reading from the detection system is compared to a similar reading obtained from a calibrated standard lamp of known output, commonly referred to as the “comparison method”. The results of this comparison determine the light output of the test lamp.

Typical quantities of interest are luminous flux, luminous efficacy, chromaticity, color temperature and CRI.

ARCHITECTURAL LIGHTING

Architectural lighting is an integral part of the aesthetics and function of architecture, emphasizing the importance of professional lighting design as part of the total design process. Architectural lighting designers rely on unique lighting designs that fuel artistic inspiration and help them to succeed and compete professionally. The lamp and lighting system manufacturers design and test their products to serve this artistic need as well as to meet industry standards for lighting systems characterization.

Total luminous flux is the photopically weighted total light output from a light source. Total luminous flux is a key parameter for determining the luminous efficacy of a lighting system. The most common method for measuring the total luminous flux of light sources is using an integrating sphere spectrometer. The reading from the detection system is compared to a similar reading obtained from a calibrated lamp standard of known output. This process is commonly referred to as the “comparison method”. Today this is commonly done with software controlled hardware. The results of this comparison determine the light output of the lighting system. Labsphere offers a complete line of integrating sphere spectrometer and photometers for luminous characterization of lamps, LEDs and lighting systems.

Typical quantities of interest are luminous flux, luminous efficacy, chromaticity, color temperature and CRI. For color LED based systems luminous flux, luminous efficacy, FWHM, chromaticity, color temperature dominant wavelength, and purity are measured.



AUTOMOTIVE LIGHTING TESTING

For most applications the lamp under test is placed in the center of an integrating sphere photometer/spectrometer which collects the total flux output of the lamp. The reading from the detection system is compared to a similar reading obtained from a calibrated standard lamp of known output, commonly referred to as the “comparison method”. The results of this comparison determine the measurement of the flux output of the unknown lamp.

For light sources with directional output, a similar measurement can be made by directing the light source through a port in the integrating sphere. Again, the reading obtained for the device under test (DUT) is compared with the calibration reading to derive the flux output of the DUT.       


For more information on the Handheld Photometer, click here

FIBER ILLUMINATOR TESTING

Manufacturers, distributors and users of boroscopes, endoscopes, and similar systems require precise calibration and/or characterization of the fiber-optic based illuminator systems used with these devices.

Measurement is performed by directing the light from the fiber illuminator or light guide into an integrating sphere, which collects the total flux from the source, and, by a process of multiple reflections, transfers a representative portion of this flux to a detection system. Typical quantity of interest is luminous flux expressed in lumens.

Click here for more information about the Handheld Photometer
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