Figure 2. Temperature increases caused by laser or LED light, with or without air cooling.

(A) Temperature increases during laser exposure at a power density of 600 mW/cm² with or without air cooling. The temperature increase could be ameliorated by about 40% using air cooling. (B) The visual images and thermal images during the laser exposure with or without air cooling. Black arrows indicate the light exposure areas. (C) Temperature increases with LED light exposure at the power density of 50 mW/cm² with or without air cooling. Temperature changes were barely observed with air cooling. (D) The visual images and thermal images during the LED irradiation with or without air cooling. Black arrows indicate the light exposure areas. Data are means ± SEM. n = 5 in each group. ^*P < 0.05 versus the other group.