Pro-Lite maintains a Konica Minolta CL-200 colorimeter that is available for short-term rental. The portable CL-200 employs a cosine-diffused, tristimulus sensor that is matched to the CIE 1931 colour matching functions. The CL-200 reports illuminance (in lux) as well as CIE tristimulus values (XYZ), CIE chromaticity (xy & u’v’ coordinates) and correlated colour temperature (CCT, in Kelvin).
The CL-200 provides a high level of measurement accuracy. The three filtered photodiodes within the sensor head are individually matched to the CIE 1931 colour matching functions, with an f1’ factor of 8% for the illuminance channel. The cosine diffuser ensures that the effective illuminance from off-axis light sources is scaled correctly.
Konica Minolta CL-200 Overview
The portable CL-200 employs a cosine-diffused, tristimulus sensor that is matched to the CIE 1931 colour matching functions. The CL-200 reports illuminance (in lux) as well as CIE tristimulus values (XYZ), CIE chromaticity (xy & u’v’ coordinates) and correlated colour temperature (CCT, in Kelvin).
The CL-200 provides a high level of measurement accuracy. The three filtered photodiodes within the sensor head are individually matched to the CIE 1931 colour matching functions, with an f1’ factor of 8% for the illuminance channel. The cosine diffuser ensures that the effective illuminance from off-axis light sources is scaled correctly. Pro-Lite’s CL-200 is supplied with an up-to-date calibration (performed within the previous 12 months) and calibration certificate. The calibration is performed using standards that are traceable to a National Measurement Institute (NMI).
The CL-200 provides illuminance measurements over 4 decades, from 0.1 to 99,900 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.
The CL-200 conveniently allows you to separate the sensor head from the main body of the meter. This allows you to hold the sensor towards the light source whilst standing to one side and reading the light level. To use the CL-200 in this way, you will need to use a couple of accessories that are supplied (T-A20 receptor unit for the main body and the T-A21 receptor unit for the sensor head with 1m LAN cable).
Basic operation of the CL-200 gives you readings of the illuminance in lux (or you can select foot candles if you prefer), chromaticity as CIE xy or u’v’ coordinates and correlated colour temperature (CCT) in Kelvin. The CL-200 also reports the tristimulus values XYZ and colour difference. Advanced operation allows you to hold a reference reading and enter colour correction factors specific to the type of light source under test. Zero adjustment is automatic, while you can either leave the meter to set its own range automatically or choose your preferred range manually. The LCD display features a backlight that turns on automatically under low ambient illumination.
The CL-200 operates from AA-size batteries (non-rechargeable) that last for approximately 72 hours of use.
| Parameter | CL-200 Specification |
| Relative Spectral Response | 3 silicon photodiode sensors spectrally matched to the CIE 1931 2° colour matching functions X(λ), y(λ) & z(λ). |
| f1’ Spectral Matching (DIN 5032) | 8%, y(λ) channel |
| Measurement Parameters | Illuminance, Ev (lux, footcandles) CIE tristimulus values XYZ CIE chromaticity coordinates (xy & u’v’) Correlated colour temperature (CCT, Kelvin) Colour difference Δ(XYZ), Δ(Ev xy), Δ(Ev u’v’) |
| Measuring Range | 0.1 – 99,990 lux >5 lux for chromaticity measurements |
| Accuracy | ± 2% illuminance ± 0.002 xy chromaticity (>800 lux, CIE illuminant A) |
| Integration Time | 0.5 seconds (continuous readout) |
| Power | 2 x AA batteries (NOT rechargeable), typical life ~ 72 hours |
| Dimensions | 69 x 174 x 35mm |
| Weight | 215g (not including batteries) |
The CL-200 is supplied with the following accessory items:
Qty | Accessory Description |
1 | T-A20 Adaptor Unit for Main Body Plugs into the CL-200 meter main body to allow the sensor head to be positioned remotely. |
1 | T-A21 Adaptor Unit for Sensor Head The CL-200 sensor head plugs into the T-A21 adaptor. Connects to T-A20 and the CL-200 main body using a (supplied) 1m LAN cable. |
1 | T-A10 Soft Case |
1 | Cap for Sensor Head |
1 | 2 x AA Batteries Note that the batteries are NOT rechargeable. |
The CL-200 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. |
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