Livestock Health And Natural Sunlight On The Animals Skin Natural sunlight is the visible spectrum and Ultra Violet UVA and UVB and Infra Red. Ultra Violet Light Kills Pathogens Natural sunlight on the earths surface is 40% Infra Red. Greenhill Roofing System Three option allow 25%, 50% or 75% of sunlight through them. A fourth option should be added that allows 85% or 90% of sunlight through. The fourth option allowing 85% or 90% of sunlight through would be used in regions like Northern Ireland and Scotland with dense cloud cover reducing the intensity of sunlight. The roofing panels and wall panels in this video that allow natural sunlight to pass through them will have a phenomenal positive impact on the health of livestock in the barn. This also applies to people working in units that have roof panels that allow natural sunlight to pass through them into the working area. The positive health benefits of natural sunlight have been grossly underestimated, this encompasses physical health and mental health. More research must be carried out on the improvement of physical health and mental health on people and livestock when in buildings as above with roof panels and wall panels that allow natural sunlight to pass through them. This especially applies to calves and young children as the importance of natural sunlight on the skin when growing at a young age has been completely misunderstood and grossly underestimated.