Together, they make the white light you see when the sun -- the main source of blue light -- is shining. Fluorescent and LED (light-emitting diode) light bulbs also give off blue light.

Together, they make the white light you see when the sun -- the main source of blue light -- is shining. Scientists think nighttime exposure to blue light throws off your circadian rhythm ...

The light sensors in our eyes can't tell the difference between artificial blue light and a bright, shining sun, so perceives this as another signal to wake up. No wonder we assume smartphones are ...

A wider bandgap means the material can absorb light that is higher-energy and has a shorter wavelength (blue), while a narrower bandgap allows the absorption of lower-energy, longer wavelength ...