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UPRtek measures illuminance and chromaticity of LEDs

The firm's compact spectro-radiometer measures illuminance and enables an evaluation of LEDs in terms of colour performance for sorting and binning tasks during manufacturing
The robust and reliable spectro-radiometer MK-350 was conceived by UPRtek as a cost-effective, mobile precision tool to measure, analyse and store the most important photometric parameters in the specification and qualification of LED, OLED and EL lamps and other luminares.



MK-350 LED meter

The MK-350 is well suited for field use in the light design of studios and workplaces, as well as in research and development. Distributor for Central Europe is Saleslink GmbH in Udenheim, Germany.

The system is based on a high-resolution (1 nm) linear CMOS sensor (receptor diameter 6.6mm) and an advanced spectroscopic architecture with embedded processor. Its spectral half-bandwidth is specified to approximately 12 nm. The compact (144 mm x 78 mm x 24 mm) and lightweight (250 g) instrument operates on rechargeable battery power. It performs an automatic dark calibration every time it is switched on.

The MK-350 measurement results are instantly displayed in its 3.5-inch LCD colour screen (320 x 240 pixels), which also serves as a convenient touch control interface. The instrument offers four basic operational modes:

"Basic" indicates the numeric value of the measured illuminance between 70 and 70,000 lux, the correlated colour temperature (CCT) in Kelvin, the standardised colour rendering index (CRI) expressed as Ra value (average of the first eight test colours) and the peak wavelength of the light source's radiated spectrum in nm.

In the second measuring mode, "Spectrum", the MK-350 displays a detailed graph of the spectral energy distribution in the radiated wavelength bands (between 360 and 750 nm) according to the measurement distance. Integration time is adjusted automatically or manually between 8 and 1000 ms.


UPRtek MK-250 LED meter in "Specrum" mode

The other two MK-350 operational modes, "CIE1931" and "CIE1976", provide the CIE chromaticity coordinates x and y, respectively u' and v', within their standardised CIE colour space diagrams.

Together with the measured illuminance, this enables an evaluation of LEDs in terms of their perceptional colour performance for sorting and binning tasks during manufacturing or in the field.

The MK-350 measures illuminance at an accuracy of +5 percent. Colour temperature is determined within +2 percent. Colour accuracy (according to CIE1931) is +0,0025, at a repeatability of +0,0005, both measured at 20,000 lux and 2856 K. CRI accuracy expressed as Ra is determined within +1.5 percent.

Measurement is initiated by touch control, either as one-time or continuous capture at selectable intervals. All measurement data (up to 2,000 files) are stored on an optional 2 GB SD-Card in an Excel- or bmp-compatible format.

A USB2.0 port enables easy data transfer. The built-in Li-Ion battery (3.7 V/ 2.5 Ah) ensures 5 hours of operation time. Operating temperature is 0 to 35 °C. Menu languages are Chinese (traditional and simplified) or English, with a German version downloadable shortly.

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