Integrating Spheres - luminous flux measurement for LEDs and lamps

Assessment of the total radiant power or luminous flux of light sources using integrating spheres is one of the most important tests in light measurement. The inside surface of an integrating sphere is coated with a diffusely reflecting material which guarantees complete integration and homogenization of the emitted radiation. The integrated light is then measured at the detector port.

Instrument Systems has developed a complete series of integrating spheres, available in a wide range of sizes and providing functionality for a broad spectrum of applications. A deciding factor in choosing the appropriate integrating sphere is the maximum dimension of the light source to be measured. Larger sources require the use of larger integrating spheres in order to keep measurement errors to a minimum.

All integrating spheres have a side entrance port for determining luminous flux in the 2π configuration (i.e. for determining emission into the forward hemisphere only). With the larger integrating spheres, the test object can also be mounted in the center, thus permitting measurements in the 4π configuration (i.e. for determining emission in all directions).  

Model Overview:

Model

Diameter

Entrance port on side

Internal lamp post

Features

Application

ISP 75 

75 mm

yes

no

can be coupled to LED Station; version available for use with LED Tester

only compatible with standard single LEDs

ISP 150L

150 mm

yes

no

for lab and production applications; version available for use with LED handlers and waferprobers; 2π measurements

for all single and high power LEDs

ISP 250

250 mm

yes

no

CIE 127 compliant for 2π measurements

for all single and high power LEDs as well as small LED modules

ISP 500  

500 mm

yes

yes

CIE 127 compliant for 2π and 4π measurements 

compatible with all LEDs, mid-sized modules and small lamps

ISP 1000 

1000  mm 

yes

yes

lamp post for both standing and hanging arrangements;
stable mounting platform for large test sources

compatible with all high power LEDs, large modules and lamps

ISP 2000

1900 mm

yes

yes

lamp post for both standing and hanging arrangements;
stable mounting platform for large test sources

compatible with all kind of lamps, luminaires and SSL products

Model specifications

ISP 75

  • 75 mm inner diameter
  • direct mounting on LED Station or on base
  • port for LED test sockets of the type LED-5xx und -6xx
  • available without port flange for use with LED sorting machines

ISP 150L

  • 150 mm inner diameter
  • version mounted on base for lab use
  • adapter plates for LED test sockets of the type LED-5xx, 6xx and -81x
  • version available for use with LED handlers and waferprobers
  • optional auxiliary light source

ISP 250

  • 250 mm inner diameter
  • CIE 127 compliant for measuring luminous flux of LEDs
  • 75 mm Ø port for coupling from the side
  • adapter plates for LED test sockets of the type LED-5xx, 6xx and -81x and for TEC test adapter of the type LED-850
  • auxiliary light source

ISP 500

  • 500 mm inner diameter
  • CIE 127 compliant for measuring luminous flux of LEDs
  • 150 mm Ø port for coupling from the side
  • adapter plates for LED test sockets of the type LED-5xx, 6xx and -81x and for TEC test adapter of the type LED-850
  • internal lamp post for mounting test sources in the center
  • auxiliary light source

ISP 1000

  • 1 m inner diameter
  • CIE compliant for measuring luminous flux of lamps and luminaires
  • 300 mm Ø port for coupling from the side
  • adapter plates for LED test sockets of the type LED-5xx, 6xx and -81x and for TEC test adapter of the type LED-850
  • internal lamp post for mounting test sources in the center
  • stable mounting platform for mounting large test sources in the center
  • auxiliary light source

ISP 2000

  • 1,9 m inner diameter
  • lamp post for measuring light sources in an upright or suspended configuration
  • robust and universal sample stage for all kinds of luminaires and SSL products
  • broad variety of standard lamp sockets for use with the internal lamp post
  • 600 mm external measurement port for launching light radiation from outside
  • auxiliary lamp to compensate for self-absorption