The Daylight Factor cannot be stated for any stand-alone product. It is a comparison of the light levels experienced throughout a building as a percentage of the daylight that is available outside the building.
A room or building with a daylight factor of less than 2% will generally appear gloomy and artificial lighting will be required for most tasks, compared to a daylight factor of more than 5% where it will appear strongly lit and minimise the requirement for artificial lighting providing that the light is uniformly distributed.
For more information on this subject, please see our ‘Estimating for Daylight Factors’ guidance document.
