Integrating Spheres & Absolute Flux Integrators

PSI’s LF series integrating sphere photometers are widely regarded as excellent quality, robust equipment for industrial or laboratory applications.

Standard sphere sizes are 0.5, 1.0, 1.5 and 2.0m diameter, however other sizes are manufactured according to customer requirements.

Features of the LF series integrating spheres include:

  1. Test item can be measured in base up, base down and horizontal attitude;
  2. In-built laser for positioning test item in geometric centre of sphere;
  3. Thermocouple measures temperature inside sphere in real-time;
  4. Powerful electromagnets lock sphere shut during testing;
  5. Auxiliary lamp for correction due to self-absorption of the lamp and monitoring of the “sphere stability”;
  6. Standard ports are for luminous flux and spectral measurement;
  7. Advanced ports (optional) for absolute measurement of luminous flux, spectral reflectance and spectral transmittance;
  8. Light-tight seals around the lips of the two halves stop stray light incursion;
  9. Spheres can be used with or without PC control (optional);
  10. Wheels to move the sphere in place and then clamp in position;
  11. Solid construction, fibreglass or aluminium sphere shell.

The software which accompanies the LF series spheres provides all of the standard requirements for the integrating sphere photometrist…. plus a few extras!

Talk With an Expert for a customised solution
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LF-2.0 & LF-3.0 for Luminaires

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LF-0.5 & LF-1.0 for Lamps

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Absolute Luminous Flux Integrators (ALFI)

  1. Devices such as power supplies, power analysers, spectrometers can be interfaced with the system;
  2. Software remembers sphere calibrations so that many test items can be measured per measurement of a reference lamp – this saves much time and is economic with reference lamp burning time.
  3. Batch mode operation streamlines the testing of multiple samples of the one test item;
  4. Sphere stability monitoring shows when to re-calibrate the sphere;
Plus, the feature we are very proud of: Automatic mode allows the user to sit back and watch as the software automatically determines the current required to achieve the lamp’s required luminous flux or colour temperature value (requires automatic power supply option to be included).

LF-2.0 & LF-3.0 Integrating Spheres for Luminaires

Specifications LF-2.0 LF-3.0
Diameter 2000 mm 3000 mm
Aperture size On request
Detector PH-1L (SP-4C and others optional)
Coating BaSO4 (Other optional) ≥ 90% on VIS
Auxiliary lamp QH lamp 90W (LED optional)
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LF Datasheet

LF-0.5 & LF-1.0 Integrating Spheres for Lamps

Specifications LF-0.5 LF-1.0
Diameter 50 mm 1000 mm
Aperture size On request
Detector PH-1L (SP-4C and others optional)
Coating BaSO4 (Other optional) ≥90% on VIS
Auxiliary lamp QH lamp 90W (LED optional)
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LF Datasheet

Absolute Luminous Flux Integrators (ALFI)

The Absolute Luminous Flux Integrator (ALFI) is a special device for absolute measurement of the luminous flux output of lamps.

It can also to measure the luminous intensity distribution of small lamps and luminaires. The lamp is placed in a rotating lamp holder in the centre of the device. A photocell is mounted on an arm, which rotates about the lamp. The lamp’s rotation presents different azimuth angles to the photocell, while the photocell sees different elevation angles of the lamp as it revolves around it. By rotating through all of the azimuth angles and measuring at the different elevation angles within each azimuth angle plane, the luminous flux is summed over the whole sphere around the lamp.

Specifications ALFI-1.0 ALFI-2.0
DUT max diameter 1200 mm 2400 mm
DUT max weight 5 kg 10 kg
Detector PH-1L
Feature Can perform light distribution test of small items.
100 mm 200 mm
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Spheres Datasheet

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