Fig. 1. Experimental setup of the in vitro cell irradiation system (A), with photographs and emission spectra for blue, green, and red LED arrays (B). The cell irradiation system consists of a Ditabis thermostat (1), two flat-bottomed 96-well plate thermoblocks (2), two 96-well plates (3), cover for the dark control sample shown as transparent for clarity (4), a 96-LED array mounted on a printed circuit board (5), cover for a 96-LED array (6), and a fan for cooling the LED array (7).