DLI Calculator
(Natural Light)

DLI values are estimated from NASA POWER monthly climatology using a standard sunlight conversion. PPFD is an average estimate from dawn→dusk for each month at the selected latitude.

Indoor note: Indoor DLI is an approximation that distributes each month’s outdoor DLI across daylight hours and applies a window-facing penalty by sun angle (plus the selected window/obstruction factors). It does not simulate your room geometry or reflections.