Labsphere’s LMS-3M Three Meter Lamp Measurement Sphere

Meets LM-79 and LM-80 standards for complete characterization of large light sources
North Sutton, New Hampshire (June 28, 2010) – With lighting technology advancing to include larger and more complex devices, Labsphere ( has introduced the LMS-3M three meter integrating sphere for complete optical characterization of these larger lamps and luminaries.  The sphere complies with IESNA LM-79 and LM-80 standards to deliver accurate and reproducible measurements of any lamp up to 2m linear lamps and 30cm luminaries.

Labsphere’s LMS-3M Three Meter Lamp Measurement Sphere.

Labsphere’s LMS-3M Three Meter Lamp Measurement Sphere.

The three meter lamp measurement integrating sphere accommodates light sources positioned base up, base down, or longitudinally, to easily and efficiently measure virtually any lamp type, including fluorescents up to 2m in length.  The design also allows for forward and partial flux measurements of test sources that are board mounted or heat-sinked.

The larger sphere better integrates light for more reliable testing of a device’s photometric and colorimetric performance with measurements of Total Spectral Flux, Luminous Flux, Correlated Color Temperature (CCT), Color Rendering Index (CRI), and Chromaticity.  Measurement data relies only on the test device’s true power, not on the size, shape, or spectral distribution. 

The near-Lambertian properties of the sphere’s Spectraflect® interior coating provides a uniform dispersion of light that integrates and reduces hotspots better than other available sphere coatings materials. Spectraflect exhibits reflectance values of 98% and is spectrally flat through the visible spectrum for higher optical efficiency on low lumen lamps. 

The LMS-3M is designed to measure a variety of lamps and luminaires on the same system with little adjustment. The standard sphere geometry accommodates 4pi measurement, and with optional aperture reducers, can easily be configured for 2pi measurement.  Baffled intake and output ports and an ambient air temperature controller maintain and monitor the temperature inside the measurement environment, complying with Energy Star requirements.  The new sphere size fully integrates with all Labsphere photometric and spectroradiometric systems and software so current system users may upgrade easily.

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