One of the biggest problems sport stadia designers face is ensuring that an excellent grass playing surface is provided throughout the year. This becomes a challenge in temperate climates, especially Northern European cities, where short winter months and high levels of cloud content in the atmosphere significantly reduces the direct sunlight exposure to the pitch. But this is further compounded by the very nature of stadia design, where the structure is enclosed around the playing surface, shading and therefore further reducing the potential amount of natural light reaching the grass.
Lighting Analysts have developed a method of optimising stadia design through the use of Climate-based Daylight Modelling and two propsoed metrics; Climatic Daylight Exposure (CDE) and Climatic Daylight Factor (CDF%).
CDE enables the total cumulative illuminance, due tothe local climate, to be assessed for different time periods throughout a typical year. By comparing the resutls for the pitch against the unobstructed site, for the same time period, CDF% values enable us to compare and optimise stadium envelop form, to allow maximum daylight penetration to the playing surface to be achieved, as well as defining the daylight distribution across the pitch, which can also assist grounds men in planning their artificial grow light maintenance strategy.