The integrating sphere is a hollow spherical shell.Widely applies in the light, chromaticity and radiant emittance measurement test situation.The interior sphere is painted with non-selective white diffuse reflection layer.The illuminance produced by the light source S at arbitrary point B is superimposed by illuminance of iterative diffuse.According to the theory of integration.We can get the illuminance of B:

In the equation (1),E1 is the illuminance on B produced by the direct irradiation from S.The value of E1 is determined by the po-sition of both  point B and the light source S.If we place a barrier between B and S,then E1=0,So the luminous of B is:

In the equation (2) r is the radius of the sphere ,ρis the reflectivity of the intine of  sphere.r andρare invariable data,so the illuminance E of an arbitrary point (eliminating the illuminance of direct irradiation) is in direct proportion to the luminous flux.So we can get the luminous flux Φ of a light source by testing the illuminance E through the window of the sphere wall.

Application range

Applicabie for photometric and colorimetric measurement of LED lamp、 mini bulbs 、 bead lamps 、high-power LED、lasers、LED lattice modules、lighting screens、high-power fluoresent lamps、HID lamps、CFL、GLS、CCFL、EEFL、halogen lamps and FCL lamps etc.

Diameter

Φ  0.1m,0.3m,0.5m,1.0m,1.5m,1.75m,2.0m,2.5m,3.0m