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LFC Integrating Sphere Spectroradiometer Systems

Labsphere LFC Sphere Spectroradiometer

Labsphere LFC integrating sphere spectroradiometers are a perfect entry-level solution for lighting product manufacturers concerned with value-for-money. Although LFC spheres are the cheapest like-for-like systems on the market, there is no compromise on Labsphere's proven high quality, or the performance of the high speed spectrometer, or the ISO17025-accredited accuracy and NIST traceability. LFC spheres are available in diameters of 0.5, 1.0, 1.5 and 2.0m. Turn-key LFC sphere systems with the option of a stabilised AC supply and AC power metering are available.

Affordable Performance & Accuracy

LFC integrating sphere systems are perfect for any price sensitive application in the measurement of the luminous flux, colour, colour temperature and colour rendering of light products. Despite their affordability, LFC systems force no compromise in terms of accuracy. The 98% reflectance Labsphere Spectraflect sphere coating minimises sphere directionality and shadowing compared with lower reflectance paints offered on competing low cost sphere. An auxiliary lamp to correct for the self absorption of the device under test is a standard fitment.

The 50cm LFC sphere is an interior-access benchtop design, while the 1.0, 1.5 and 2.0m models are all floor-standing. All LFC spheres provide for both interior access 4pi flux as well as external 2pi forward flux measurements.

All LFC spheres are supplied as standard with a 600 lumen standard lamp of spectral flux. Uniquely, Labsphere's standard lamps are calibrated in its NVLAP-accredited, ISO 17025-compliant metrology laboratory. NVLAP accreditation signifies that Labsphere operates in accordance with stringent guidelines pertaining to quality systems, engineering expertise, technical personnel, test and calibration methods, laboratory equipment and environment, measurement traceability, handling of test and calibration items, and accuracy in test and calibration reports.

High Performance Spectrometer & User-Friendly Software

LFC systems are offered with Labsphere's CDS-600 and CDS-610 high speed CCD array spectrometers. Each spectrometer records a complete spectrum in a flash - that's the advantage of an array spectrometer over a more traditional scanning monochromator. The CDS-600 and 610 are standard CCD array spectrometers with third-decimal-place colorimetric accuracy suitable for production testing of luminaires and solid state lighting. The CDS-600 and CDS-610 have a wavelength range of 350-850nm and 350-1000nm, respectively.

» Download the CDS-600 series datasheet

Each LFC system is supplied as standard with an enhanced version of Labsphere's well regarded LightMtrX application software. The LFCMtrX software additionally provides remote control of a current regulated power supply that powers both the auxiliary lamp and the calibration lamp. LFCMtrX software also provides for remote control of the optional AC power supply and automatic reporting of the power consumption of the device under test (LEX and LES AC systems, below).

LFC LEX / LES AC Systems with Regulated AC Supply and Metering

For the ultimate in ease-of-use, LFC LEX and LES systems are available that incorporate a regulated AC power supply and AC power meter within the LFC electronics enclosure (shown in image, top of page). When specified, the power supply is remotely controlled from within Labsphere's LFCMtrX software and the power consumption of the device under test is automatically reported within the standard report template provided with the software, thus simplifying the reporting of luminous efficacy (lumens per Watt).

Not Just Any Integrating Sphere - a Labsphere

Labsphere's Spectraflect integrating sphere coating is an environmentally and optically stable coating  which provides 98% diffuse reflectance. The design of LFC spheres conforms to the requirements of IESNA LM-78, LM-79 and LM-80. Of special note is the high quality mechanical design and light-tight construction of Labsphere integrating spheres. On spheres of 100cm and larger, there is the provision for base-up and base-down mounting of the standard 4pi centre mount post assembly. All spheres feature a 2pi port for measuring the forward - or partial flux of directional light sources.

Choosing the Correct Sized Sphere

In accordance with LM-79 guidelines, the following are the recommended sphere sizes for the size of the device under test:

  • Omnidirectional - area of the DUT not larger than 2% of the sphere area.
  • 2pi (forward flux) measurement - opening of sphere should be less than 1/3 of the sphere diameter.
  • Linear or tubular fittings - the length of the DUT should be less than 2/3 sphere diameter.
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