Both the DLI and the photoperiod influence the growth and development of plants, and are
It is often measured in greenhouses and growth chambers to aid in light management and decision making.
Apogee Instruments DLI meters consist of a cast acrylic diffuser (filter), optical filter, photodiode, and signal processing.
circuitry and an LCD display mounted in an ASA plastic case. DLI meters are designed for single or continuous operation.
PPFD or ePPFD measurements; DLI; and photoperiod. The DLI meter uses a USB-C cable (included with the
meter) to download the data stored as a CSV file to a computer.
SPECIFICATIONS
Calibration Uncertainty: ± 5 %
Measurement Repeatability: Less than 0.5 % Display Range: 0 to 4000 µmol mˉ² sˉ¹
Long-term Drift: Less than 2 % per year Field of View: 180˚
Spectral Measurement Range: (± 5 nm)370 to 650 nm (sunlight only)
Directional (Cosine) Response: ± 5 % at 75˚ zenith angle
Temperature Response: -0.04 % per C
Response Time: 2.5 seconds
Measurement Frequency: 3 minutes
Data Log Capacity: 99 days (DLI & Photoperiod), 10 days (30 min PPFD/ePPFD averages)
Non-linearity: Less than 1 % (up to 2500 µmol mˉ² sˉ¹)
Stored Data Resolution (PPFD): 0.1 µmol mˉ² sˉ¹ (when ≥ 1000, the screen will not display the decimal)
Stored Data Resolution (DLI): 0.1 mol mˉ² dayˉ¹
Stored Data Resolution (Photoperiod): 0.1 hours
Connectivity: CSV file via USB-C data transfer
ADC Resolution: 24 bits
Operating Environment: -10 to 60 C; 0 to 100 % relative humidity
Ingress Protection: IP65
Mounting Compatibility: Brass 1/4-20 threaded mount
Battery Life: Approximately 6 months
Dimensions:1.91 W x 2.31 H x 0.93 D (inches)Mass67 g
Warranty: 4 years against defects in materials and workmanship
Manufactured: Assembled in the USA
