How do I estimate daily light integral (DLI) from peak sunlight intensity?
Choose the light units on your sensor. PAR light in micromoles/m2/s is the most accurate for estimating DLI
Measure light level at solar noon. You can find the time of day when solar noon occurs for your location and day of year at https://gml.noaa.gov/grad/solcalc/
You can find the time of apparent sunrise for your location and day of year at https://gml.noaa.gov/grad/solcalc/
You can find the time of apparent sunset for your location and day of year at https://gml.noaa.gov/grad/solcalc/