Spectrum Technologies LIGHTSCOUT 3415A Manual de usuario

Quantum PAR Light Meter

PRODUCT MANUAL

Item # 3415A

FOR USE UNDER ANY LIGHT SOURCE, INCLUDING LED

Specifications

Range: PAR Light 0.0 to 6500 µmol m-2 s-1, 400 to 700nm

DLI (Daily Light Integral) 0.0 to 560.0 moles m-2 day-1

Display Resolution: PAR Light 0.1 µmol m-2m-2 s-1 from 0.0 to 99.9,

1 µmol m-2 s-1 from 100 to 6,500

DLI 0.1 moles m-2 day-1

Accuracy: ±5% (each meter is calibrated to a NIST traceable light sensor

on a broad-spectrum light source)

Azimuth Error: ±1% over 360°

Daily Light Integral (DLI): Calculated continuously from light readings every 3

minutes

Water Resistant: IP-65 rated for use in rain, irrigation, and condensing environ-

ments (do not submerge)

Operating Environment: 32-130°F(0-55°C) with 0-100% RH (condensation ok)

Battery: CR2032 3v lithium coin cell included (2-year battery life)

Size & Weight: 5.75 x 1.75 x 0.85in (14.6 x 4.5 x 1.8cm), 0.17lb (77g)

Response Data: (Red line is meter response; Black line is ideal response)

Spectral Response Cosine Response

Features

• Provides accurate PAR light readings from ANY light source:

• Full sun to full shade indoors or outdoors.

• Artificial light sources (LED, High Pressure Sodium, Metal Halide,

Fluorescent, Halogen...).

• Three modes of operation:

• Instant Spot Measurement mode for PAR light readings.

• Scan mode for quickly averaging PAR over an area.

• DLI mode shows Daily Light Integral on the LCD (no computer

needed).

• Integral mounting plate for: stand, stake, lanyard & hanger hole, and

magnet mounts.

• Small size allows light readings in tight spaces - no need for an exter-

nal sensor.

• 1/4-20 threaded hole for mounting on camera tripods & stands.

• Includes sensor cover & soft carrying case.

Sensor Cap

Light Sensor

LCD Display

POWER Button

SCAN Button

Battery Compartment

Universal Mounting Bracket

Meter Components

The LCD will show an empty battery icon when it is time to change

the battery. Remove the screw cover of the battery compartment by

rotating counter clockwise. A coin may be required to loosen the

cover. Gently pry out the old battery with a small knife or tiny screw-

driver as shown below, being careful not to damage the battery

holder. Replace with a new CR2032 lithium coin cell battery and

replace the screw cover. Tighten the cover clockwise until the o-ring

seal is slightly compressed.

Changing the Battery

WARNING: Battery can explode or leak and cause burns if installed

backwards, disassembled, charged, or exposed to water, fire or

high temperature.

CR2032 Battery CALIFORNIA ONLY: Perchlorate Material – spe-

cial handling may apply. See www.dtsc.ca.gov/ hazardouswaste/

perchlorate.

Cleaning the Sensor

Use a damp cloth to clean the light sensor; mild soap may be used

if needed. Do NOT use chemicals like alcohol, acetone, or ammo-

nia-based cleaners. These can damage the white diffuser disk.

Instantaneous PAR Light Readings

Remove the sensor cap and press

the POWER button to turn on the

meter. The DLI value is displayed

for 3 seconds (see DLI section).

The meter then measures and dis-

plays instantaneous PAR light

readings about once per second.

The meter’s software automatically

stabilizes readings from 50 or 60

Hz light sources.

The display automatically turns off

after 5 minutes if no buttons are

pressed. You can also turn it off by

pressing the POWER button.

Scanning an Area for Average PAR Light

While the meter is displaying In-

stantaneous readings press and

hold the SCAN button, then move

the light meter steadily and fluidly

under the area for which you desire

an average light reading. Scanning

can be done for up to 35 seconds.

The LCD will flash “SCAN” while

the button is held, once released,

the meter will display the average

light reading from the duration of

the scan. This average reading will

be displayed for 4 seconds before

the meter returns to instantaneous

readings.

Note: To take a light measurement where the display cannot be

read, press and hold the SCAN button for 1 second. The reading

will then be displayed for 4 seconds.

Meter Operation

Daily Light Integral (DLI) Readings

The LightScout® Quantum PAR

Light Meter takes a light reading

every 3 minutes to use in calculat-

ing a 24-hour Daily Light Integral

(DLI). Every 15 minutes the previ-

ous 24 hours of stored readings

are used to recalculate the DLI.

Readings are automatically taken

whether the meter is on or off, as

long as there is a battery in the

meter. The current DLI value will

be displayed on the LCD for 3 sec-

onds every time the meter is

turned on, including after a power

cycle (off and on).

The DLI calculation can be reset to zero by pressing and holding

both the POWER and SCAN buttons simultaneously until you the

DLI value changes to 0.0. The integration and calculation of DLI will

start accumulating a new 24 hours’ worth of 3-minute readings from

that point forward.

Mounting Bracket Configurations

Meter Operation

Lanyard

Hanger / Magnet

Stake

Vertical Stand

The LightScout® Quantum PAR Light Meter is designed for measur-

ing PAR light indoors and outdoors regardless of light source type.

It works well for greenhouse, field, and R&D applications requiring

reliable plant growth light readings.

The chemical reaction of photosynthesis requires light. Unlike ener-

gy based light measurements, the quantum (quantity) of photons is

measured since it can be directly tied to the number of these chemi-

cal reactions that can take place. The measure of all available light

between the wavelength (color) range of 400 to 700 nanometers

(nm) has been accepted as the best measure of light available for

photosynthesis. This is defined as quantum Photosynthetic Active

Radiation (PAR) in units of µmol m-2 s-1. This is referred to as PAR

light, Quantum light, PPF (photosynthetic photon flux - photons

emitted by a light), and PPFD (photosynthetic photon flux density -

photons hitting a surface) interchangeably, and is the total quantity

of photons in µmoles over the light spectrum from 400 to 700 nm

hitting a one-meter square area every second. One micromole is

equal to 602,214,085,700,000,000 (6.022 x 1017) photons of light!

This is not the same as foot candle or lux measurements as shown

in the figures below.

Understanding PAR Light

Foot-Candle/Lux Meters

(Human Eye Response)

PAR Meters

(Plant Response)

Understanding PAR Light

Daily Light Integral (DLI)

If photons were raindrops, light meters would show the intensity of a

rainstorm. A five minute rainstorm may look impressive, but often

provides less water than an all-day drizzle. As cumulative rainfall is

measured with a rain gauge, the cumulative quantity of light is

measured by recording and summing the light intensity over time,

by convention, a 24 hour period.

The LightScout® Quantum PAR Light Meter can also determine the

total number of photons incident on one square meter over a 24-

hour period. This is defined as the Daily Light Integral (DLI) and is

displayed in moles per square meter per day. The typical range for

DLI is 3 to 26 moles m-2 day-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 lighting.

Cosine Response (Sun Angle Effect)

This meter is designed to accurately display light intensity readings

±80° from vertical. As illustrated below, less light is hitting your crop

as the light source (sun) is tilted from vertical. This is called cosine

effect and is accurately measured by the specially shaped diffuser

on the top of the light sensor. 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.

3600 Thayer Court

Aurora IL 60504

(800) 248-8873 or (815) 436-4440

Fax (815) 436-4460

E-Mail: [email protected]

www.specmeters.com

R 07/20

Warranty

This product is warranted to be free from defects in material or workman-

ship for one year from the date of purchase. During the warranty period

Spectrum will, at its option, either repair or replace products that prove to

be defective. This warranty does not cover damage due to improper instal-

lation or use, lightning, negligence, accident, or unauthorized modifications,

or to incidental or consequential damages beyond the Spectrum prod-

uct. Before returning a failed unit, you must obtain a Returned Materials

Authorization (RMA) from Spectrum. Spectrum is not responsible for any

package that is returned without a valid RMA number or for the loss of the

package by any shipping company.

DECLARATION OF CONFORMITY

Spectrum Technologies, Inc.

3600 Thayer Court

Aurora, IL 60504 USA

Model Number: 3415A

Description: LightScout Quantum PAR Light Meter

Type: Electrical Equipment for Measurement, Control, and

Laboratory Use

Directive: 2014/30/EU

RoHS Directive: 2011/65/EU

Standards: EN 61326-1:2013

EN 55011:2016+A1:2017

Michael Dunning, Director of Product Strategy July 1, 2020

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