Ten hours. On average, that’s how long we spend looking at screens every day. This means for 10 hours a day we expose our eyes to blue light. Not only are you getting artificial blue light from your screens, but you also get blue light from energy-efficient fluorescent bulbs and LED lights in your home or building that are used in lamps and light fixtures. Studies have shown that lighting in your home can affect your mood, energy, metabolism and your sleep.