Compute Time Above Threshold (TAT) for light exposure

Calculates the total duration for which illuminance exceeds a given threshold, expressed in minutes.

Usage

compute_tat(trace, threshold = 1000, window = NULL)

Arguments

trace

An object of class luxR_trace (see light_trace()).

threshold

Numeric scalar, illuminance threshold in lux. Default 1000, a common cutoff for outdoor/bright light exposure.

window

Optional length-2 POSIXct vector giving c(start, end) to restrict the calculation to. Default NULL (use the whole trace).

Value

A numeric scalar, minutes above threshold.