Fig. 6.

NO levels rise during red light exposure in an irradiance-dependent manner. (a) Graph of mean percent change ($\mathrm{\Delta }f/f$ DAF-FM fluorescence) ± standard error of NO relative to exposure time (min) to 635-nm light at irradiances of $400\pm 8.9$, $800\pm 17.9$, or $1600\pm 35.8\mu \mathrm{W}/{\mathrm{cm}}^2$ (*$p<0.01$). (b) Graph of mean percent change ($\mathrm{\Delta }f/f$ DAF-FM fluorescence) of NO relative to radiant exposure in $\mathrm{J}/{\mathrm{cm}}^2\pm \text{standard error}$ with irradiances of $400\pm 8.9\mu \mathrm{W}/{\mathrm{cm}}^2$ (gray line), $800\pm 17.9\mu \mathrm{W}/{\mathrm{cm}}^2$ (black line), or $1600\pm 35.8\mu \mathrm{W}/{\mathrm{cm}}^2$ (dashed line).