Integrating Spheres

ILT manufactures integrating spheres designed to meet the vast majority of your light measurement needs. Integrating Sphere diameters include 5" and 2".

"10" Integrating Sphere"


  • Spectral range: 225 to 1400 nm
  • Internally baffled to eliminate direct detector exposure and first-bounce measurements
  • Works with all model spectrometers with SMA905 fiber attachments as well as on ILT light meters
  • Typical applications: LED intensity/beam flux, laser power, fiber optic light guide, endoscope or collimated beam measurement, beam candela, mean spherical candlepower, lumens, watts
  • Special port design allows sphere to be used to improve cosine response and allow irradiance and spectral irradiance calibration with ILT light measurement systems
  • Made in USA


ILT has been manufacturing integrating spheres for over 55 years. Our Integrating Spheres product line offers a versatile selection capable of measuring watts, lumens, candela, lux, joules, W/cm2 etc. ILT integrating sphere-based systems support measurements from a wide variety of light sources including lasers, fiber optic light guides, endoscopes, small sources such as miniature halogen lamps, LEDs, neon lamps and larger sources such as LED modules, flashlights, automotive lamps and more.



Reflectance Chart

ILT integrating spheres can be combined with our ILT2400 Hand-held, ILT5000 and ILT1700 Research Radiometers, as well as with our ILT950 and ILT960 Spectrometers for spectral characterization including CRI, CCT, chromaticity, and total flux in watts, and power.

The interior surface of ILT's Integrating Spheres is coated with #6080 White Reflectance Coating which produces a stable, efficient and highly diffuse reflectance over a broad wavelength range of 250-2500 nm (see graph).


ILT Integrating Spheres


INS125 5 Inch Integrating Sphere



Designed as a powerful accessory to the ILT950, ILT960, ILT2400, ILT5000 and ILT1700 light measurement systems.  Allows for total flux measurements of LED's, small lamps, low power lasers, fiberoptic guides and collimated beams of light. The removable port adapter also allows calibration and readout in absolute irradiance with excellent cosine correction. Unit is configured with 2, 20 mm diameter ports and one 40 mm diameter port for maximum versatility. System includes, wrench, 5 inch sphere, 1 detector port adapter and 3 removable port covers. Port covers are painted with the same reflectance material as the sphere to assure maximum performance and also can be used as a reflectance standard.   (Calibration sold separately)


INS50 2 Inch Integrating Sphere


  PORTS: 2
  1. SMA905
  2. 7 mm diameter input port
  Can be mounted on most SED(SEL) detectors/filter assemblies with the use of the P10 or P11 and appropriate adapters.

  Note: Detector & Stand Not Included with Sphere.


Integrating Sphere Accessories


A100 Transfer Lamp and 5VDC Power Supply can be used to accurately adjust calibration or readings for almost any application.

A250 Lamp Mount/Adapter painted with the same reflectance surface as all integrating spheres.

A125 Port Adapters - 1 included with INS125, additional units sold separately

A254 50 mm Port Adapter fits over 50 mm ports to allow better zero as well as test of light loss caused by the structure of the item under test.

P10 Patchcord Adapter - SMA905 Male to SSTL ferrule with 11 mm OD with 1000 um Fiber. Connects ILT sensors to ILT integrating spheres and other Female SMA905 optics. P10 Photo

P11/P12 Patchcord Adapter - SMA905 Male to Male adapter with 1000 um Fiber. Connects ILT spectrometers and detector to ILT Integrating spheres and other Female SMA905 optics  Available in three lengths, P11-2 (2 inches), P11-4 (4 inches), P12 (12 inches) long.   P11 Photo

P6SMAW Fiber Optic Adapter required for attachment of SMA905 fibers to the detector measurement port.

A204 Small Tripod with 1/4 20 thread for use with INS50, INS125, ILT950 optice and SED(SEL) detectors.