Konica Minolta



CRI Illuminance meter CL-70F

A compact, easy to use instrument for measuring light sources, including LED lighting and EL lighting. The CL-70F provides an entry-level solution for measurement of Colour Rendering Index, spectral irradiance, peak wavelength, tristimulus values, chromaticity, correlated colour temperature, dominant wavelength, excitation purity, illuminance, and difference values.


Main features of CL-70F

  • Spectral sensor
  • Measure CRI
  • Compact, easy to carry and battery operated
  • Color touch screen

The portable CL-70F body is designed for a variety of common lighting tasks including lighting design and ongoing maintainance. Providing spectral information and CRI measurement the CL-70F provides entry level access to cutting edge light measurement features. Combining the instrument with a flash sync cable enables spectral measurements of flash light making the CL-70F a powerful tool for professional imaging and entertainment markets.

CL-70f display of measured CRI data

CRI measurement
The CL-70F provides easy access to CRI measurement data. The display shows the Ra value including all individual indices (R1 to R15) in a simple bar graph. For further information on Colour Rendering please see our light measurement resource : The Language of Light.

Easy measurement of correlated color temperature (Tcp)
The CL-70F can measure correlated color temperature and the difference from the blackbody locus Δuv, values which are often used to describe the color of light sources. The colour temperature of light is defined as the absolute temperature (in Kelvin) at which a blackbody would emit that particular color of light. The colours of light emitted by a blackbody at various temperatures can be plotted on a curve which is called the "blackbody locus". Since the output of many light sources do not lie directly on the blackbody locus, "correlated colour temperature" is used to describe their colours.

Screen caputers of the CL-70f Chromatic Display, Spectral Information and measurement overview

When describing a colour using correlated colour temperature, normally the difference from the blackbody locus ∆uv is stated in addition to the correlated colour temperature. To learn more about colour temperatue please read our light measurement resource : The Language of Light.

Rotating Receptor Head
The rotating receptor head improves screen visibility and comfortable use of the instrument.

Rotating receptor head of the CL-70f
Sensor of the CL-70f

Easy Zero-adjustment without a receptor cap
Slide the ring on the diffusor counterclockwise to perform dark calibration.

Additional features provided by included Utility software CL-SU1w
With the software CL-SU1w which is included as a standard accessory, you can modify instrument settings, store & group data and make further analysis of the measured data.

Screenshot of data in CL-SU1w showing colour Space, CRI and Spectral Information