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How to Measure CRI and Illuminance with the 500 Series Spectrophotometer

CL-500 Illuminance Spectrophotometer

The CL-500A Illuminance Spectrophotometer is our first hand held version of this instrument and is capable of measuring CRI and illuminance right on the unit. It’s completely stand-alone and turn-key. Simply turn it on, and start measuring.

The CL-500A can be used in a broad range of industries including lighting products manufacturing and lighting product design, where it’s important to measure CRI, color temperature and illuminance all at the same time.

Compact and easy to use, the CL-500A has a built in lithium battery which can be charged via a USB port.

In addition to spectral power distribution, this instrument is capable of measuring illuminance in foot candles or lux and chromaticity, excitation levels, dominant wavelength, color temperature and CRI.

The instrument is simple and not intimidating, even for first time users. There are only a few controls to deal with – the on / off switch, the measure button, the up / down controls for the screen, the back key, the menu key and the return key. To take a measurement, simply point the cosign-corrected receptor head of the device at the light source, hit the measure button, and you’ll get an instant return of the reading.

Another component of this spectrophotometer is its zero calibration cap that fits over the receptor head. It serves two purposes: one is to protect the receptor head; and two is to provide a means to zero out the unit. Periodically it will ask you to do a zero calibration to ensure the accuracy of the instrument.

After performing a measurement, you can access other metrics than the one showing on the screen. To do this, go into the menu, scroll down to Measure Options, hit return, go down again to Color Space, hit the return button again, and you’ll see all the different combinations of data you can display on the screen.

Among the displayable data are:

Lux or foot candles and x and y
Lux color temperature for delta UV
Lux dominant wavelength and excitation
CRI, which will show individual indices from R1 through R15, including CRI, which is a combination or an average of R1 through R8
Spectral data
Customized readings

Konica Minolta’s CL-500A Illuminance Spectrophotometer is among the most advanced light measurement devices available anywhere.

If you’d like to know about Konica Minolta’s CL-500A or any of our other products, feel free to call us at +65 6895 8685, or you can contact us through our website.

About the Author: Mervin Woo
Mervin Woo is currently the Sales Manager for Konica Minolta Sensing Singapore Pte Ltd. Mervin graduated from The Royal Melbourne Institute of Technology (RMIT University) and joined Konica Minolta (previously known as Minolta Singapore Pte Ltd) in 1996. With over 17 years’ experience in the field of light and colour instrumentation industry, Mervin has been invited to give talks in several conferences and seminars on light and colour management, jointly organised by various industry associations, such as Society of Information Display (Singapore and Malaysia Chapter), and International Commission on Illumination (CIE), Malaysia. He has also written an educational handbook, The Language of Light, which explains basic concepts in photometry and colorimetry. This handbook also gives an overview on photometric and colorimetric instrumentations and addresses important considerations on instrument’s selection.
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