The vividness or intensity of light is calculated in lumens. For case in point, when you are at home, most artificial light is about 400 to 600 lumens. If you go outer surface on a sunny day, the brightness range from about 1,000 lumens in the darkness to more than 6,000 lumens on a large stretch of existing, like a highway. Our eyes are contented until we get to around 3,500 lumens. When the brilliance of the direct or reflected brightness gets to about 4,000 lumens, our eyes commence to have difficulty absorbing the light. What we distinguish when we try to look at these brighter areas are flash of white -- this is glare. To reduce the embarrassment caused by the quantity of light entering our eyes, we squint. Once you get to around 10,000 lumens, your eyes are so bombarded that they begin to completely block out the light. Prolonged introduction to light of such intensity can cause damage consequential in temporary or even permanent sightlessness. That's why unprotected viewing of a large snowfield, which on a dazzling day can reflect light at more than 12,000 lumens, can product in being "snowblind."

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