Labsphere’s FFS-100 series forward flux standards are tungsten halogen sources that have been purpose designed for calibrating integrating sphere spectroradiometers for the measurement forward spectral radiant flux from 350 to 1050nm. Each FFS standard is calibrated traceable to NIST standards and is an NVLAP accredited product per ISO/IEC 17025:2005. Compared to bare incandescent sources, the output of an FFS is highly directional and optimal for calibrating integrating spheres for the measurement of directional sources over 2pi steradians.
Labsphere Forward Flux Standards Overview
Labsphere’s FFS-100 series forward flux standards are tungsten halogen sources that have been purpose designed for calibrating integrating sphere spectroradiometers for the measurement forward spectral radiant flux from 350 to 1050nm. Each FFS standard is calibrated traceable to NIST standards and is an NVLAP accredited product per ISO/IEC 17025:2005. Compared to bare incandescent sources that radiate into 4π steradians, the output of an FFS is highly directional and optimal for calibrating integrating spheres for the measurement of directional sources over 2π steradians.
Screening, Seasoning & Calibration
Labsphere’s standard lamps are selected for their stability and reproducibility. Each standard has been carefully screened, seasoned, and calibrated at Labsphere’s New Hampshire manufacturing facility under the guidelines recommended by the NVLAP accredited ISO 17025 practices for the highest degree of confidence. Lamps are first seasoned for 1% of their rated life and then screened for stability and repeatable performance before they are selected for calibration.
The selected lamps are then calibrated directly by substitution method to a NIST traceable spectral flux reference for a calibration result you can rely on. The calibration data provided includes the lamp’s spectral radiant flux in units of Watts per nm, reported from 350 to 1050nm, as well as other parameters such as the luminous flux in lumens and the correlated colour temperature (CCT) in Kelvin. All lamps are supplied with a calibration certificate that include a complete uncertainty analysis.
Ordering Information
Labsphere forward flux standard lamps are available in two power levels, either 300 or 650 lumens. The FFS comprises the tungsten halogen lamp installed in a bespoke housing that attaches directly to the directional source port on a Labsphere integrating sphere. Adaptors for other spheres are available.
Individual Forward Flux Calibration Lamps – 2π flux calibration
Labsphere Forward Flux Lamp Standards Specifications
Parameter | Specification |
Lamp Types | Tungsten halogen (incandescent) |
Rated Outputs | FFS-100-400: 300 lumens |
Rated Lifetimes | 2,000 hours |
Power Input, DC | FFS-100-400: 12V, 4.167A |
Calibration Type | Total spectral radiant flux (W/nm) from 350-1050nm |
Traceability | NIST Traceable |
Calibration Geometry | 2π steradian |
Parameters Reported | Spectral radiant flux, W/nm |
Seasoning Time | 1% of rated life |
Mount | Attaches directly to the directional source port on a Labsphere integrating sphere. Adaptors for other spheres are available on request |
Labsphere forward flux standard lamps are intended for calibrating integrating sphere spectroradiometers and photometers that are used for measuring the total spectral radiant flux or luminous flux from directional sources. Typical products include LEDs, spot lights and down lighter luminaires.
The forward flux standards have rated life times of 2,000 hours. To ensure that the lamps are not operated beyond their rated lives, the operator is strongly recommended to maintain a logbook of when each lamp is used and for how long. Operating a standard lamp beyond its rated life risks increasing the rate of lamp depreciation, and hence invalidating its calibration. The use of a “soft ramp”, current regulated, DC power supply is highly recommended. By gradually increasing the current that you apply to the calibration lamp, you minimise the thermal shock to the filament and help maintain the lamp’s calibration over a longer period. A current regulated power supply maintains a stable lamp output – the flux emitted from an incandescent lamp varies non-linearly with the current applied.
When calibrating an integrating sphere, you may choose between a 4π steradian (spherical) or a 2π steradian (hemispherical) measurement, the latter being chosen for directional solid state lighting based upon LEDs. A 2π calibration lamp is designed for mounting at the wall of an integrating sphere which will be used to measure the forward (hemispheric only) flux from the device under test placed at an external port on the sphere. The Labsphere FFS-100 series calibration lamps meet the requirements for 2π integrating sphere calibration as stated in IES LM-79.
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