Quantum PAR Light Meter XAR-P20

Quantum PAR Light Meter XAR-P20

Features

Provides accurate PAR light readings from full sun to full shade indoors or outdoors and artificial light sources (LED, High Pressure Sodium, Metal Halide, Fluorescent, and Halogen)

PAR light measuring range from 0 to 9999 umol.m-2.s-1

Support three modes of operation: 

        --Instant spot-check measurement mode for PAR light readings PPFD; 

        --Scan mode for quickly averaging PAR over an area; 

        --DLI mode shows Daily Light Integral

Accurate and instant response

Easy to read large backlight display

Only two buttons and easy to operate

Telescopic wand with tripod

Four AA alkaline batteries

Applications

Measurement of incident PPFD on plant canopies in outdoor environments or in greenhouses and growth chambers, and reflected or under-canopy (transmitted) PPFD measurement in the same environments

For gardeners, agronomy application measuring PPFD

Device

1.        PAR light sensor

2.        LCD display

3.        Power button

4.        Function button

5.        Battery compartment back cover

Daily Light Integral (DLI)

DLI is displayed in moles per square meter per day. The typical range for DLI is 3 to 26 mol.m-2.d-1. This is useful for understanding the average amount of light your crop sees in a day. One mole is equal to one million micromoles.

Each type of plant has a different DLI range for optimal growth. DLI is directly correlated with plant quality, and a minimum amount of light is required for marketable plants. Measuring DLI can guide in decisions regarding shade cloths and supplemental light.

XAR-P20 Quantum PAR Light Meter is designed for spot-check measurements, and calculation of DLI through the built-in logging feature.

Cosine Response (Sun Angle Effect)

Ideally a horizontally projected light source should show no available light for your crop regardless of its intensity. Conversely, a directly overhead light source will have 100% of its light available for your crop. Some of the radiation coming into a sensor at low angles is reflected, causing low readings. This is called cosine effect. The convex optical disc found on the sensor of this meter is designed to capture radiation at low angles and minimize cosine response errors.

Specifications

PAR Specification

General