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We experience the sun’s visible light in all that we see, and the sun’s warmth (infrared radiation) which we feel. UV light cannot be seen or felt but is carcinogenic to human skin. There is a huge variation in UV levels each day. The UV level is affected by a number of factors including the time of day, time of year, cloud cover, altitude, proximity to the equator, scattering and reflection. The time you can spend in the sun at different UV levels also depends on your skin colour. The darker your skin the longer you can stay in the sun.