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ISP-REF Integrating Sphere


The ISP-REF Integrating Sphere provides even surface illumination for reflectance measurements of surfaces such as the color of flat samples.

The ISP-REF has 10.32 mm (0.41”) sample port aperture, a transfer optic assembly for restricting the fiber viewing angle and a built-in tungsten-halogen light source. The sphere is coated with Spectralon®, a white diffusing material that provides a highly Lambertian reflecting surface. A simple switch allows users to manipulate the sphere for the inclusion (I) or exclusion (E) of specular reflectance.

ISP-REF-B Replacement bulb for ISP-REF.





54 mm x 57 mm x 83 mm (LWH)


864.7 g

Spectral range (built-in lamp):

~360-2500 nm

Sphere diameter:

38.1 mm

Sample port diameter:

10.32 mm

Sphere coating:

Spectralon doped with BaSO4

Spectralon reflectivity:

>98% (400-1500 nm) >95% (250-2000 nm)

Reflectance measurements:

Diffuse or specular and diffuse

Bulb life:

900 hours

Bulb color temperature:

3100 K

Replacement bulb:



SMA 905