Apogee Instruments DLI-600 ePAR, Daily Light Integral, and Photoperiod Meter (400-750 nm)

DLI-600 ePAR METER - The Apogee Instruments' DLI-600 is an elegant, simple-to-use device for spot checking photosynthetically active radiation (PAR) in the traditional 400-700 nm range as well as extended photosynthetically active radiation (ePAR) in the 700-750 nm range. ePAR has recently been shown to enhance cell expansion and help with photosynthesis when paired with PAR exposure. In addition to measuring ePAR, the DLI-600 meter calculates daily light integral (DLI) and photoperiod. DLI refers to the total amount of PAR or 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). ePAR, 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-600 is accurate under all light sources. ACCURATE, STABLE MEASUREMENTS - Our research-grade sensors are trusted by scientists and serious growers all over the world for their accuracy and stability. Hobby-grade meters are often accurate out of the box, but drift in accuracy quickly. However, Apogee research-grade quantum sensors have an industry-leading accuracy drift rate of less than 2 % per year. All sensors are NIST traceable and are built and calibrated at our headquarters in Logan, Utah, USA. MEASUREMENT MODES - This rugged, water resistant, and compact meter is perfect for single (spot checking areas) or continuous measurements of ePPFD; DLI; and photoperiod. The DLI-600 meter has two different screen modes to display the measurements: stored data and live view data. In the stored data screen, it shows the DLI measurement, photoperiod, and which day the data was collected (up to 99 days ago). The live view data screen displays a running average of ePPFD from the last 2.5 seconds. Measuring and controlling the DLI and the hours of light a plant receives (photoperiod) is critical for optimizing plant health, triggering flowering, and inducing other plant morphology effects. ePPFD, DLI, and photoperiod data can be viewed onscreen or downloaded via USB-C cable for analysis. RUGGED & READY TO USE - Built tough and rated IP65 to withstand harsh and humid environments, the DLI-600 can be carried around for spot checking, placed directly on any level surface, or mounted by attaching to commonly available camera tripods, clamps, or stakes using the standard 1/4-20 threaded port on the bottom. The DLI meters consist of a cast acrylic diffuser (filter), optical filter, photodiode, signal processing circuitry, and an LCD display mounted in an ASA plastic housing. Each DLI package includes the meter, a protective carrying case, two AAA batteries, a quickstart instruction guide, a screwdriver, a soil spike for easy mounting, and a USB-C cable for downloading the meter's stored data as a CSV file to a computer. MADE IN THE USA - All meters are designed, built, and calibrated at our headquarters in Logan, Utah, USA. Apogee Instruments has been creating research-grade instruments for scientists and serious growers for over 25 years. All meters are backed by our industry leading four-year warranty and supported by our world-class, US-based customer support team. Apogee Instruments DLI-600 Specs 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): 394 to 747 nm Directional (Cosine) Response: ± 5 % at 75˚ zenith angle Temperature Response: -0.11 ± 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 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 dayˉ¹ Stored Data Resolution (Photoperiod): 0.1 hours Connectivity: CSV file via USB-C data transfer ADC Resolution: 24 bits Operating Environment: -40 to 70 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) Mass: 67 g Warranty 4 years against defects in materials and workmanship Manufactured: Assembled in the USA