True spectrum.
True measurement.
Precision optical measurement for spectra, photometry, color and light distribution — from a single instrument to a fully integrated laboratory.
FEATURED SYSTEM
Product showcase
A unified template: instrument, composition, reports and key curves.
Fiber Spectrometer
A 350–800 nm fiber spectrometer for CCT, CRI, chromaticity, luminous flux, peak wavelength, PPF and PPE.
KEYUAN
What's in the system
From the instrument and probes to software — delivered as a complete measurement chain.
Reports & data output
Results are exportable and traceable for data retention and reporting.
DATA & SOFTWARE
INSTRUMENT
Complete test report
Find your measurement system
Browse by spectra, photometry, light distribution, transient, spheres and transmittance/haze.
Spectrometers
350–1050 nm fiber spectrometers for visible, NIR and UV spectral and color measurement.
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Photometry & Illuminance
Wireless multi-channel illuminance meters and flashlight photometry for field uniformity, beam distance and runtime.
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Goniophotometers
Horizontal, vertical, dark-box, flash/obstruction, bicycle, UV/IR and automotive goniophotometers with IES output.
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Transient & Flicker
Transient intensity for flashes, warning/obstruction/lifejacket lights, plus LED flicker and hazard classification.
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Integrating Spheres & Photometric Systems
Visible, VIS-NIR and UV integrating-sphere systems for flux, color, radiant power and electrical parameters.
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Transmittance & Haze
Visible, UV, VIS-NIR and broadband spectral transmittance, plus diffusion and haze measurement.
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Turn light distribution
into usable design data
The KYG series covers horizontal, vertical, dark-box and flash/obstruction goniophotometers — 3D intensity, beam angle, total flux and isolux curves, with standard IES output for Dialux, AGI32 and more.
- ANGLE ACCURACY
- better than 0.1°
- MEASUREMENT MODES
- C-γ / B-β / A-α
- OUTPUT
- IES / PDF / Excel
- LUMINAIRES
- Indoor / road / flood
Technical notes
Integrating spheres, error control, goniophotometry and terminology — field experience turned into practical methods.
Integrating Spheres: Size, Coating and 2π/4π Selection
Sphere selection directly affects luminous flux data. A practical guide covering diameter, material, test mode, coating and sample size.
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Tolerance Limits and Judging Measurement Results
What tolerances apply to standard and reference lamps? How should CRI, power factor, efficacy and SDCM be judged? A practical acceptance guide.
Learn moreReducing Measurement Error: From Sphere to Operator
The same instrument can produce a 20% flux difference between operators. A practical checklist across sphere, method, environment and operator.
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Science in light.
Measurement in truth.
Hangzhou Keyuan Optoelectronics is based in Yuhang, Hangzhou, focused on the R&D, manufacturing and service of optical test and measurement systems for LEDs, luminaires, automotive lighting, UV sources and research.
Need a configuration or custom system?
Tell us about your sample, parameters and production cycle. We reply within one business day.