The effects of blue, white and green LED lights on the cell viability.
(A) The exposure of blue, white and green LED light to cells cultured in a 96-well plate. (B) The observation of cell morphology using bright field microscopy, showing blue LED light caused the morphological changes compared with the control. Green LED light did not change the cells. (C–E) The quantitative evaluation of cell viability by the CCK-8 assay. This result is consistent with the observed change in cell morphology. Cell viability was reduced by blue and white LED light exposure, but not green LED light. The scale bar represents 50 μm. Data are expressed as mean ± SEM (n = 6). ## indicates p < 0.01 vs. control (ANOVA).