The following was posted on Max Pierson's Website.
Useful Daylight Illuminance (UDI): Another variation on Daylight Autonomy, UDI attempts to penalize for direct sunlight that falls into the space, on the theory that people will find this glary and distracting. UDI is a set of three numbers for every point in the space, the percentage of time that a point was below a minimum threshold, between a useful minimum and maximum value, and above a maximum value, which could result in glare or thermal discomfort. Often 10fc is used as the lower bound of useful illuminance, and 250fc on the upper bound.
Since you’re generating three data points for every spatial point, it’s difficult to assess performance at a glance or communicate how well the space performs to someone who isn’t a specialist.
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