Source Imaging Goniometer SIG-400 - near-field luminous intensity measurement
Precise Measurement Of Near-Field Luminous Intensity Small Light Source
Radiant Vision Systems SIG-400 is built and designed specifically for LEDs and small light source by capturing image data describing the spatial structure of the luminance and chromaticity of the light source from multiple viewing angles. Radiant Vision Systems Source Imaging Goniophotometer SIG-400 is an advanced instrument designed for measuring the angular distribution of light emitted from a light source, typically used for analyzing and evaluating the performance of LEDs and small light source.
The SIG-400 uses a unique imaging system that captures a 2D picture of the light emitted from the source, as well as its distribution in 3D space. This allows for accurate measurement and analysis of a wide range of lighting parameters, such as intensity, color, and spatial distribution.
The instrument is equipped with a rotating base that allows for precise positioning of the light source, and can measure light distributions over a full hemisphere, as well as in specific angular ranges. The SIG-400 is also capable of performing measurements at multiple wavelengths, making it useful for evaluating the color rendering properties of light sources.
The SIG-400 is Radiants 4th generation Source Imaging Goniometer. SIG-400 can be applied to a broad range of measurement applications by merging our latest advances in imaging colorimetry, robust mechanical design, industry-leading accuracy, and easy-to-use control software. It provides a cost-effective solution by focusing on the needs of LED measurement applications.
Overall, the Radiant Vision Systems Source Imaging Goniophotometer SIG-400 is a powerful tool for lighting engineers, designers, and manufacturers looking to optimize the performance and quality of their lighting products.
The SIG-400 system consists of a ProMetric® Imaging Colorimeter, a goniometric assembly for positioning the imaging colorimeter and the light source relative to one another, and SIG 2.0 Control and Analysis Software. The SIG-400 captures images of the light source from multiple angles, building a 3-dimensional spatial image of the color and luminance output of the light source. These measurements are aggregated into a Radiant Source Model™ (RSM) format, which is a detailed, industry-standard model for representing a light source’s near-field data. RSMs are used to compare the optical properties and designs of various LEDs and to generate input to the most common optical design software packages for use in luminaire and optical system design. Learn more
APPLICATIONS
LED Design | LED Package Design | LED Characterization | Provide LED Model To Custom

Radiant Vision Systems SIG-400
- Optimized for LED die and device measurement
- Multiple optical configurations for field of view and resolution
- Provides near-field models for luminance and color
- Generates Radiant Source Model™ (RSM) files with integrated image data for complete analysis
- Easy and intuitive setup for optional spectrometer
System Recommendations
- 3.0 GHz and 8 cores
- 16 – 32 GB RAM
- Windows 7 or 10, 64 bits
- Dual-monitor video output
- Ethernet 100/1000 or USB 2.0
Radiant Vision Systems SIG-400
Optical specifications and Capabilities | ||
CCD Type | Interline cooled and temperature-stabilized CCD | |
System Dynamic Range | >60 dB | |
Resolution | 600 x 600 | 1081 x 1081 |
Extended FOV: Micro (with SIG-400MF20 option) | 0.6 mm | 1.3 mm |
Extended FOV: Micro (with SIG-400MF0 option) | 1.1 mm | 2.4 mm |
SIG-400EF | 98 mm | 212 mm |
Color Meausrement ¹ | CIE 1931 matched XYZ filters | |
Neutral Density Filters | ND 0, 1, and 2 standard; up to ND 5 optional | |
Measurement Capability | Luminance, luminous intensity Color: CCT; CIE x,y; u’,v’; ∆E | |
Mechanical Specifications | ||
Overall Size | 71 cm x 56 cm x 125 cm | |
Operating Footprint | 74 cm x 127 cm | |
Azimuth Motion | 0° ~ 360° | |
Inclination | ±140° | |
Angular Step Size | 0.10° minimum for both azimuth motion and inclination | |
Run Out | 0.015 mm mechanical-optical-software run out | |
Weight | 130 kg | |
Construction | Welded steel frame for thermal stability and rigidity |
Specifications subject to change without prior notice
¹ Photopic-only option available for purchase
Source Imaging Goniometer SIG-400