A testing kit (printed circuit board) had to be designed for
the measurements. The testing kit contained, among other
things, a luxmeter designated "HK-01 Data Logger", developed
by scientists at the Faculty of Electrical Engineering and
Computer Science, VSB - Technical University in Ostrava. The
main meter was a JETI 1211 spectrophotometer, based on
which the observed data could be evaluated. All measured data
were transmitted to and stored by a laptop.