DLI Meters Intro with Dr. Bruce Bugbee
Accurate, Stable Measurements
Meters are cosine-corrected to maintain accuracy when radiation comes from low angles (± 5 % at 75° zenith angle). Long-term non-stability determined from multiple sensors in accelerated aging test and field conditions is less than 2 % per year.
Data Collection and Display
Meter displays real-time PPFD/PAR or ePPFD/ePAR in µmol m-2 s-1; daily light integral (DLI) in mol·m-2·d-1; and photoperiod in 0.1 hour increments. DLI and photoperiod measurements are recorded continually every three minutes with a darkness threshold of .1 µmols and the meter can also display the instantaneous data for spot checking areas. Daily data is stored up to 99 days and displayed onscreen by toggling through the screens. DLI, photoperiod, and 30 minute PPFD averages can be downloaded as CSV files via the USB-C port under the battery cover using the included USB-A to USB-C cable.
Housing is built tough to withstand harsh environments and is dustproof and waterproof up to IP65. Unit consists of a cast acrylic diffuser (filter), optical filter, photodiode, signal processing circuitry, LCD display, and two AAA batteries (included).