illumia®Plus2 Integrating Hemisphere Spectroradiometers
Designed to measure forward emitting lamps, LEDs, board mounted and heat-sinked LED Light Engines for Solid State Lighting (SSL), the hemisphere system features a Spectraflect® coated hemisphere capped with an interior mirrored surface which creates a virtual integrating sphere within the interior.
A centrally placed port in the mirrored surface allows for the Device Under Test (DUT) to be internally mounted in the center of the virtual sphere while keeping the electrical and thermal controls of the DUT outside, reducing absorption errors that can occur in a traditional sphere based system.
The central mounting of the hemisphere allows for users to easily mount the lamp in the center of the sphere with the lamp driving device remaining on the outside of the sphere, reducing absorption errors. The center mounting combined with the internal mirrored surface allows for symmetrical light distribution by the specular image minimizing integrating error within the sphere. The hemispherical design of the system also allows for a smaller footprint being only half the size of a traditional integrating sphere system. The integrating hemisphere is recommended by IES as an alternative method to the integrating sphere for measuring total luminous flux.