Portable, light weight and easy to carry meter for measuring illuminance and light source color

The CL-70F CRI Illuminance Meter is a cost effective portable illuminance meter with a spectral sensor and is an entry level solutions for measuring CRI (Color Rendering Index), spectral irradiance, illuminance, chromaticity, CCT (Correlated Color Temperature), DW (Dominant Wavelength) and Pe (Excitation Purity) of various light sources. The measure of color temperature is an important part of determining the correctness of a LED illumination. The CL-70F uses precision sensors coordinate with the International Commission of Illumination (CIE) define color matching functions.

The CL-70F can be used with commercially available flash sync cable to take spectral measurement of photographic flashlight.

The utility software CL-SU1w is included as standard and adds further functionality for capturing and analysing data.


Measurement and evaluation of special illumination sources used for restaurant, museum, stages, studios etc. | Electroluminescence (EL) lighting | Building and interior lighting research | Projector light source research and color inspection | Color viewing cabinet maintenance | Evaluating light distribution characteristics of LED illumination module and etc.


CL-70F CRI Illuminance Meter

  • Easy to use & easy-to-read display
  • 180⁰ rotating receptor head
  • Dark calibration can be performed without needing a cap
  • Measurement of flashlights
  • Measurement data of chromaticity, dominant wavelength & excitation purity
  • Wide measuring range
  • Conforms to JIS A Class and DIN Class C
  • Includes utility software CL-SU1w

CL-70F CRI Illuminance Meter


CL-70F CRI Illuminance Meter

Illuminance meter class

Conforms to requirements for Class A of JIS C1609-
1:2006 “Illuminance meters Part1: General measuring
instruments; Conforms to DIN 5032 Part 7 Class C


CMOS linear image sensor

Spectral wavelength range

380 to 780 nm

Output wavelength pitch

1 nm

Measuring range

Constant light: 1 to 200,000 lx; 1,563 to 100,000 K
(Chromaticity display requires 5 lx or more)
Flashlight: 20 to 20,500 lx・s; 2,500 to 100,000 K

Accuracy *1, 2 (Standard illuminants A)

Ev (Illuminance): +5%+1 digit of displayed value
xy: 0.003 (at 800 lx)

Repeatability (2 σ) (Standard illuminant A)

Ev: 30 to 200,000 lx: 1%+1digit; 1 to 30 lx: 5%+1digit (*3)
xy: 500 to 200,000 lx: 0.001 (*4)
xy: 100 to 500 lx: 0.002 (*4)
xy: 30 to 100 lx: 0.004 (*4)
xy: 5 to 30 lx: 0.008 (*4)

Visible-region relative spectral response characteristics (f1′)

Within 9%

Cosine response (f2)

Within 6%

Temperature drift (fT)

Ev: +5% of displayed value; xy: +0.006

Humidity drift (fH)

Ev: +3% of displayed value; xy: +0.006


2 AA-size batteries (Alkaline batteries or manganese dry
cells); USB bus power

Response Time

Constant light (Maximum): 15 sec
Constant light (Minimum): 0.5 sec
Flashlight: 1 ~ 1/500 sec (in 1-step intervals) (*5)

Color indication modes

Correlated color temperature Tcp, Difference from blackbody
Δuv, XYZ, xy, u’v’, Dominant wavelength λ d, Excitation purity
Pe, Spectral irradiance, Ev, CRI (Ra, Ri), Peak wavelength
λ p, exposure value

Other functions

Data memory: 999 data; Preset function; Auto power off

Display languages

English, Japanese, Chinese (Simplified)


USB 2.0 Mini B

Operation temperature/humidity range

-10 to 40°C, relative humidity of 85% or less (at 35°C) with no condensation

Storage temperature/humidity rangen

-10 to 45° C, relative humidity 85% or less (at 35° C) with no condensation

Dimensions (W x H x D)

73 x 183 x 27 mm (Not including projecting buttons)
D (max): 40mm


230 g

*1 Measurement mode: Constant light (range L), Exposure time: AUTO

*2 Linear for Ev

*3 10 times measurement (2σ) /Ave

*4 10 times measurement (2σ)

*5 Shutter speed