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DLI-600: ePAR, Daylight Integrator and Photoperiodic Meter (ePAR, 400-750 nm)

Updated:2022-12-21

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  • Brand: APOGEE
  • Model: DLI-600
  • Description: DLI-600 spectrometer is a new product in 2022. It is an elegant and easy to use device for spot checking photosynthetically active radiation (PAR) beyond the traditional 400 – 700 nm range. DLI-600 me
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Product Details

DLI-600: ePAR, Daylight Integrator and Photoperiodic Meter (ePAR, 400-750 nm) Summary:

User's Manual

DLI-600 spectrometer It is a new product in 2022. It is an elegant and easy to use device for spot checking photosynthetically active radiation (PAR) beyond the traditional range of 400 – 700 nm. DLI-600 measures the newly defined 400-750 nm ePAR radiation range, which has been proved to have extended photosynthetic activity characteristics. In addition to measuring ePAR, the DLI-600 meter also calculates Daylight Integration (DLI) and Photoperiod. EPAR, DLI and photoperiod affect plant growth and development. They are usually measured in greenhouses and growth chambers to help with light management and decision-making.








Accurate and stable measurement:Apogee research level quantum sensors have an accuracy drift rate of less than 2% per year, and all sensors are NIST traceable.

Measurement mode: This sturdy, waterproof and compact instrument is very suitable for single (spot check area) or continuous measurement of PPFD or ePPFD; DLI; And photoperiod. The DLI-600 instrument has two different screen modes to display measured values: storing data and viewing data in real time. In the Stored Data screen, it displays the DLI measurement, the optical period, and the date the data was collected (up to 99 days ago). The Live View Data screen displays the average ePPFD run in the last 2.5 seconds. Measuring and controlling DLI and the light time (photoperiod) received by plants is essential for optimizing plant health, triggering flowering and inducing other plant morphological effects. EPPFD, DLI and photoperiod data can be viewed on the screen or downloaded via USB-C data lines for analysis.

Rugged and ready to use: The DLI-600 is sturdy and durable, with the protection level of IP65, and can withstand harsh and humid environments. It can be carried around for spot check, placed directly on any horizontal surface, or connected to the commonly used camera tripod, fixture, or the standard used at the bottom ¼- 20 threaded ports. The DLI instrument consists of a cast acrylic diffuser (filter), an optical filter, a photodiode, a signal processing circuit, and an LCD display mounted in the ASA plastic housing. Each DLI package includes the instrument, a protective suitcase, two AAA batteries, a quick start guide, a screwdriver, a soil nail for easy installation, and a USB-C cable for downloading the data stored in the instrument to the computer as a CSV file.

DLI-600 spectrometer drawing:

DLI-600 spectrometer specifications:

Calibration Uncertainty ± 5 %
Measurement Repeatability Less than 0.5 %
Measurement Range 0 to 4000 µmol mˉ² sˉ¹
Long-term Drift Less than 2 % per year
Field of View 180˚
Spectral Measurement Range (± 5 nm) 383 to 757 nm
Directional (Cosine) Response ± 5 % at 75˚ zenith angle
Temperature Response -0.11 ± 0.04 % per ℃
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 4000 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 dˉ¹
Stored Data Resolution (Photoperiod) 0.1 hours
Connectivity CSV file via USB-C data transfer
ADC Resolution 24 bits
Operating Environment -40 to 70 ℃ ; 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)
Mass 67 g
Warranty 4 years against defects in materials and workmanship
Manufactured Made in the USA

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