DLI-400: PAR, Daily Light Integral, and Photoperiod Meter (Sunlight Only, 400-700 nm)

DLI-400 SUNLIGHT ONLY METER - New for 2022, the Apogee Instruments' DLI-400 is an cost-effective, simple-to-use device for spot checking photosynthetically active radiation (PAR; 400–700 nm) levels and measuring daily light integral (DLI) and photoperiod under sunlight and some broadband light sources only. DLI refers to the total amount of PAR or extended PAR (ePAR) incident on a plane in a 24-hour period, expressed in units of moles per square meter per day (mol m-2 d-1). Photoperiod is the total amount of time in which PAR or ePAR is incident on a plane during a 24-hour period and is expressed in units of hours (h). PAR, DLI, and photoperiod influence plant growth and development, and they are often measured in greenhouses and growth chambers to aid in light management and decision making. The DLI-400 is a low-cost option accurate under sunlight and some broadband light sources only, but if you are looking for a model accurate under all lights, see our DLI-500 model. APOGEE QUALITY