The EU Scientific Committee has concluded that there is no evidence of direct adverse health effects from LEDs in normal use by the general population. Cellular and animal studies showing adverse effects appeared to be conducted under exposure conditions that were difficult to relate to human exposures or used exposure levels in excess of internationally agreed exposure limits.
There is a low level of evidence that exposure to light in the late evening, including that from LED lighting and/or screens, may have an impact on the circadian rhythm. At the moment, it is not yet clear if this disturbance of the circadian system leads to adverse health effects. Children have a higher sensitivity to blue light and although emissions may not be harmful, blue LEDs (between 400 nm and 500 nm) including those in toys may be very dazzling and may induce photochemical retinopathy, which is a concern especially for children below three years of age. Older people may experience discomfort from exposure to light that is rich in blue light.
To read more about this on the European Commission website go to: Final Opinion on Light Emitting Diodes (LEDs) – European Commission