Integrating Sphere | Ulbricht Sphere | Optical Spheres

An integrating sphere is a precision optical instrument utilized for comprehensive photometric, colorimetric, and radiometric analysis of light sources and luminaries. It enables accurate measurement of key parameters including luminous flux (lumen), chromaticity coordinates, correlated color temperature (CCT), dominant wavelength, and peak wavelength.

The IS-*M series represents the traditional integrating sphere design. LISUN has transitioned from this legacy production to the advanced A-molding technology, embodied in the IS-*MA series A-Molding Lumen Sphere.

Specification: A-Molding Lumen Sphere vs. Traditional Optical Sphere

• Coating Material Specification: The interior coating material complies with CIE Publication No.84 (1989). The sphere walls are coated with BaSO4 (Barium Sulfate). PTFE (Polytetrafluoroethylene) material is available as an optional coating.
• Spectral Reflectance: ρ(λ) ≥ 0.96 within the spectral range of 450nm to 800nm, and ρ(λ) ≥ 0.92 within the spectral range of 380nm to 450nm.
• Optical Diffusion & Accuracy: Provides fine, uniform diffusion through multiple internal reflections. Typical reflectance ρ ≈ 0.8 with a spectral reflectance accuracy of ρ(λ) < 1.5%.
• Integrated Test Fixtures: The sphere incorporates standardized lamp testing jigs, including E27 sockets and holders for T5, T8, and T12 fluorescent tubes. A dedicated testing holder base accommodates LED modules and various other luminaires. Samples under test can be installed in both upward and downward orientations within the sphere.
• Electrical & Auxiliary Integration: Features built-in power cabling, terminal blocks, and a designated position for an optional auxiliary lamp. Integrated power sockets provide convenient connection for the lamp under test (LUT).
• Sensor & Port Configuration: Includes two (2) photodetector ports, one (1) optical fiber port, and a temperature sensor access hole as standard.
• A-Molding Technology Advantage: Traditional integrating spheres are constructed from multiple assembled segments. LISUN’s proprietary A-Molding Technology produces a monolithic sphere structure, resulting in superior sphericity and enhanced measurement accuracy.
• Alignment System: Incorporates a built-in cross-hair laser alignment system to facilitate precise centering of both calibration standard lamps and lamps under test within the optical sphere. (Note: This feature is not included on integrating spheres with a diameter of 1.0 meter or less.)

Application

The optical sphere functions as a critical component within a spectroradiometer system for the precise measurement of photometric, colorimetric, and radiometric parameters.

• IS-0.3M / IS-0.5M Models: Designed for testing LEDs, LED modules, miniature LED bulbs, and other compact light sources. Typical luminous flux measurement range: 0.001 lm to 1,999 lm.
• IS-1.0MA Model: Suitable for testing compact fluorescent lamps (CFLs) and standard LED bulbs. The flux testing range is…