The light that we typically are exposed to on a daily basis is highly dynamic and varies substantially throughout the day (Espiritu et al., 1994; Hébert, Dumont, & Paquet, 1998; Okudaira, Kripke, & Webster, 1983; Savides, Messin, Senger, & Kripke, 1986). This results in a luminous profile containing intermittent bright light; periods above a certain ‘bright light’ threshold (e.g., 1000 or 2000 lux at the eye) alternate with periods below this threshold. In intermittent bright...
Source: https://osf.io/um29q/