Daily Light Integral calculator

Calculate the light intensity and photoperiod required to achieve a certain daily light integral, for an electric light source such as indoor LED (light-emitting diode) lighting.

Enter only two of the three pieces of information in this app to calculate the third unknown value. For example, enter light intensity and photoperiod to calculate daily light integral. If you enter all three values, clicking the Calculate button will update the daily light integral value.

Close

Light intensity, in micromoles per square meter per second of photosynthetically active radiation (PAR light, 400 to 700 nm wavelengths) is the light level you would measure at one moment in time using a quantum light sensor.

Close

Photoperiod refers to the number of hours per day that lights are turned on.

Close

Daily light integral (DLI) refers to the accumulated light over a 24 hour period, in moles per square meter per day of PAR. Typical DLI levels are 5 to 8 moles/2/day for propagation, and above 10 moles/m2/day for flowering and fruiting.