The Konica Minolta CL-70F is our most affordable, hand-portable illuminance spectroradiometer. Designed along similar lines to a touchscreen smart phone, the CL-70F is slim, compact and easily transported in your pocket or bag. Being a spectroradiometer rather than a more traditional tristimulus colorimeter helps to ensure that the CL-70F gives accurate readings with any type of light source, including LEDs. Measure the spectrum (380-780nm), the illuminance (lux), the correlated colour temperature of white light sources (CCT, Kelvin), the CIE chromaticity (xy or u’v’), the dominant wavelength of coloured light sources (nm), the Δuv value (the distance from the Planckian black body locus) and the CIE colour rendering index, CRI (Ra, R1-15).
The Konica Minolta CL-70F is our most affordable, hand-portable illuminance spectroradiometer. Designed along similar lines to a touchscreen smart phone, the CL-70F is slim, compact and easily transported in your pocket or bag. Being a spectroradiometer rather than a more traditional tristimulus colorimeter helps to ensure that the CL-70F gives accurate readings with any type of light source, including LEDs. Measure the spectrum (380-780nm), the illuminance (lux), the correlated colour temperature of white light sources (CCT, Kelvin), the CIE chromaticity (xy or u’v’), the dominant wavelength of coloured light sources (nm), the Δuv value (the distance from the Planckian black body locus) and the CIE colour rendering index, CRI (Ra, R1-15).
Traditional colorimeters such as the Konica Minolta CL-200A are based upon three silicon photodiodes that are spectrally matched to the CIE 1931 tristimulus colour matching functions. While suitable for most types of broadband (white) light sources, tristimulus meters struggle to give accurate colour and illuminance readings with monochromatic lamps (for example, single colour LEDs – especially blues and reds). This is where a spectroradiometer like the CL-70F comes in as the spectral power of the lamp is recorded and the appropriate photometric and colorimetric parameters computed from look-up tables stored in the instrument memory.
The CL-70F has been thoughtfully designed with a rotating sensor head. This allows the operator to angle the sensor towards the light source and stand to the side or behind and still view the screen. This minimises measurement errors associated with shadowing of the sensor, or for situations where the operator themselves may reflect stray light into the sensor.
The CL-70F provides illuminance measurements over from 1.0 to 200,000 lux (colour readings require 5 lux or higher). In nature, illuminance typically ranges from about 0.01 lux on a dark night to about 100,000 lux on a hot summer day. Workplace illumination is normally around 500-1000 lux.
| Parameter | CL-70F Specification |
| Sensor Type | Cosine-diffused CMOS array spectroradiometer |
| f1’ Spectral Matching (DIN 5032 Part 7) | Conforms to DIN class C |
| Measurement Parameters | Spectral power, 380-780nm Illuminance, Ev (lux, footcandles) CIE chromaticity coordinates (xy & u’v’) Correlated colour temperature (CCT, Kelvin) Dominant wavelength (nm) Colour difference Δ(XYZ), Δ(Ev xy), Δ(Ev u’v’) CIE colour rendering index, CRI (Ra, R1-15) |
| Measuring Range | 1.0 – 200,000 lux >5 lux for chromaticity measurements |
| Accuracy | ± 5% illuminance (1-3,000 lux) ± 0.003 xy chromaticity (>800 lux, CIE illuminant A) |
| Integration Time | 0.5 -15 seconds (continuous readout) |
| Interface | USB |
| Power | 2 x AA batteries (NOT rechargeable) |
| Dimensions | 73 x 183 x 27mm |
| Weight | 230g (not including batteries) |
The following accessories are supplied as standard with the CL-70F:
Qty | CL-70F Standard Accessories |
1 | CL-A12 Soft Case |
1 | 2 x AA Batteries Note that the batteries are NOT rechargeable. |
1 | CL-SU1w Data Management Software |
The CL-70FA is capable of performing the following measurements:
Measurement | Units | Application |
Illuminance | lux or footcandles | Illuminance of lamps, LEDs, luminaires, sunlight, vehicle headlamps (etc). |
Luminous Intensity | candelas | The luminous intensity of a lamp may be computed by applying the inverse squared rule to the measured illuminance. Note that the illuminance must be recorded in the photometric far-field. |
CIE Chromaticity | xy & u’v’ | The colour of the illumination from a lamp or other light source. |
Correlated Colour Temperature | Kelvin | The CCT defines the shade of white light from a lamp or other light source. 3000K is described as “warn white” while 5000K is referred to as “cool white”. Light with a CCT of between 2000K and 20000K can be described as white light. |
Dominant Wavelength | nm | The dominant wavelength of a coloured lamp or other light source defines the equivalent monochromatic colour on the spectrum locus of the CIE 1931 colour space that the test source most closely resembles. |
Colour Rendering Index | CRI | The CIE colour rendering compares how naturally a test light source renders certain standard colours compared to a reference light source, for example sunlight. The CIE CRI metric computes 15 special colour rendering indices (R1-15) and also the general colour rendering index Ra, which is the average of R1-8. |
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