Abstract: Abundant, eco-friendly, continuous and free, source of day lighting has a potential to reduce the consumption of 20% of lighting load of a garment factory. Various models of daylight harvesting have been experimented with in various production floors with great success. Apart from obvious advantage of energy conservation, harvesting of sunlight has many industrial advantages as well as positive impact on psychological and physiological health of workers in apparel sector. Implementing daylight harvesting solution has many challenges starting from consistency of the sunlight throughout the day& round the year, penetration of light in vertical structure &deep regions, apart from commonly known issues of glare and radiation. This review paper discusses all aspects of day light harvesting.