Topcon SR-LEDW Spectroradiometer

Wide Dynamic Range Spectroradiometer

The SR-LEDW and the SR-LEDW-5N are the top-end models of Topcon’s SR Series line of spectroradiometers (including the SR-3AR, SR-UL1R, SR-UL2, and the SR-LEDH).  The SR-LEDW Spectroradiometer is capable of measuring wide dynamic ranges from an ultra-low luminance of 0.0005 cd/m² to an ultra-high luminance of 5,000,000 cd/m².  The SR-LEDW-5N model has a half bandwidth of 5nm or less versus 5nm to 8nm for the SR-LEDW.



Measure wide dynamic range with accuracy

Measures luminance and color as low as 0.0005 cd/m2 and as high as 5,000,000 cd/m2 with high accuracy

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*±

Four apertures available

Four (4) apertures 0.1°/0.2°/1°/2° enable you to measure luminance from small to wide area without attachment lens


Luminance, Chromaticity, and Color Temperature measurement of LCDs, CRTs, OLEDs, LEDs, etc

Transmittance of LCD polarizing plates & filters

Luminance and color measurement of various light sources

Optical SystemObjective lens: f=82mm F2.5
Eyepiece lens: View field 5°, Diopter adjustment range ±5 diopter
Measurement Distance350mm – Inf.
Luminance Range cd/m20.0005 ~ 1,500,0000.0015 ~ 4,500,0000.0375 ~ 5,000,0000.15 ~ 2,000,000
Spectral Range380 ~ 780 nm range @ 1 nm resolution
Spectral BandwidthSR-LEDW-5N: 5nm or less (half width)
SR-LEDW: 5nm to 8nm (half width)
Luminance Accuracy±2% (for standard illuminant A)
Color Accuracy±0.002 in 1931 CIE x,y Space
Spot Size at 1m32.2 mm16.1 mm3.2 mm1.6 mm
Min. Spot Size at 35cm10 mm5 mm1 mm0.5 mm
DimensionsApprox 406mm (L) x 150mm (W) x 239mm (H)

Ordering Information

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

  • Instrument with standard lens
  • AC adapter
  • Lens cap
  • Hard shell carrying case
  • Manual
  • USB Cable
  • CD containing CS-900A software

See the SR-LEDW 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.