Topcon SR-LEDH Ultra High Speed Spectroradiometer

Topcon SR-LEDH
Ultra-High Speed Spectroradiometer

NEW PRODUCT ALERT – As of February 2022, the Topcon SR-LEDH has been replaced by the SR-5 Series. Please visit the SR-5 Series Product Page to learn more.

The SR-LEDH Spectroradiometer is designed to meet the demands of production line or QC testing with its fast measurement mode, SDK, and slim body housing.  The SR-LEDH is capable of measuring ultra-high luminance displays and LEDs up to 4,500,000 cd/m² in under half a second.



High-speed measurement (0.4 sec)

Measures luminance and color as high as 4,500,000 cd/m2 with high accuracy and speed (0.4sec) via LAN and FIX mode


Designed for Production Line or Equipment

Slim body design, software development kit (KIT), and fast measurements make the SR-LEDH ideal for production line testing


Luminance, spectral distribution, and CCT measurements

Supports Luminance, Spectral Distribution, CIE1931 and CIE1976 chromaticity coordinates, Tristimulus value XYZ, CCT and Deviation, CIE1976 L*a*b*, Eab*± , CIE1976L*u*v* Euv*±


Luminance, Chromaticity, Color rendering index and Color temperature for LED Backlights, LED illuminators

Luminance and Chromaticity of automotive headlights and interior panels

Luminance and color measurement of various light sources

Parameter Measurement Angle
Optical System Objective lens: f=82mm F2.5
Collimating lens: View field 5°
Measurement Distance 350mm – Inf.
Luminance Range cd/m2 10 ~ 1,500,000 30 ~ 4,500,000
Spectral Range 380 ~ 780 nm range @ 1 nm resolution
Luminance Accuracy ±2% (for standard illuminant A)
Color Accuracy ±0.002 in 1931 CIE x,y Space
Spot Size at 1m 32.2 mm 16.1 mm
Min. Spot Size at 35cm 10 mm 5 mm
Dimensions Approx 413mm (L) x 98mm (W) x 232mm (H)

Ordering Information

The base unit model number is SR-LEDH and includes:

  • Instrument with standard lens
  • AC adapter
  • Lens cap
  • CD containing CS-900A software

See the SR-LEDH Brochure for available options. Popular options include:

  • AL-6 and AL-11 adapter lenses (for reducing the measurement spot)
  • Tripod and fine adjustment stand (gimbal)
  • Fiber optic probe

If you can’t find what you are looking for, contact us for info on Topcon options and accessories.

Want to find out more?

If you are interested in more information, send us an inquiry.