Spectrum Technologies LightScout 3415F Manuale utente

Quantum Light Meters

PRODUCT MANUAL

Item # 3415F, 3415FQF, 3415FSE, 3415FXSE,

3415S, 3415SQF,3415SSE,3415SXSE

CONTENTS

Meter Operation 3

Changing the Battery 3

PAR Light 4

Foot-Candles 5

Cosine Correction 6

Specifications 7

Warranty 7

Thank you for purchasing a LightScout® Light Meter. This

manual describes the features and operation of the following

meters:

3415F, 3415S Quantum Light Meter (Solar Calibration)

3415FQF, 3415SQF Quantum and Foot-Candle Meter

3415FSE, 3415SSE Dual Solar/Electric Quantum Meter

3415FXSE, 3415SXSE External Sensor Solar/Electric

Quantum Meter

Read it thoroughly to ensure proper and effective use. For

customer support, or to place an order, call

Spectrum Technologies, Inc.

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

between 7:30 am and 5:30 p.m. CST,

FAX (815)436-4460,

E-Mail: info@specmeters.com

www.specmeters.com

The LightScout Light meters use a standard 9V battery. To

change the battery:

1. Remove the two screws on the back of the meter.

2. Lift the back from the bottom of the meter.

3. Remove the old battery from the connector, and snap the

new battery in its place. Set the battery into the front half

of the case.

4. Connect the front and back of the case at the top (by the

sensor).

5. Close the case and tighten the two screws.

Meter Operation

1. Turn the dial clockwise to the “ON” position. Dual mode

meters (3415FQF, 3415FSE, 3415FXSE, 3415SQF,

3415SSE, 3415SSXE) have two “on” settings, one to ei-

ther side of “OFF”.

2. Hold the meter (or for the 3415FXSE & 3415SXSE, the

sensor) vertical for accurate readings.

3. Turn the meter off after use to conserve battery power.

4. The external sensor for the 3415FXSE & 3415SXSE me-

ters is designed to enable attachment to a rod (or yard-

stick) for ease of measurement in or above the canopy.

Changing the Battery

Photosynthesis is driven primarily by photos of light with wave-

lengths between 400 and 700 nanometers, which is referred to

as Photosynthetically Active Radiation, or PAR light. Because

a quantum is the amount of energy possessed by a photon,

PAR light is sometimes labeled quantum light. The intensity of

PAR light is referred to as Photosynthetic Photon Flux Density

(PPFD), which is measured in units of µmol m-2 s-1 (the num-

ber of photons, in units of micromoles, striking an area one

meter square each second). Quantum Light Meters are cali-

brated to display PPFD.

LightScout Quantum Light Meters are calibrated for sunlight.

Due to differences in the spectrum generated by artificial

lights, the following adjustments must be made in the value

shown on a sunlight-calibrated meter:

Fluorescent: reads 8% high, so multiply the display by 0.92.

Metal Halide: reads 6% high, so multiply the display by 0.94.

High Pressure Sodium: 0% error—no adjustment needed.

Sunlight: 0% error—no adjustment needed.

Note that the 3415FSE and 3415FXSE meters display accu-

rate readings for fluorescent lights when set to “Electric”.

The chart below displays the spectral response of the Quan-

tum Light Meters.

PAR Light

Foot-Candle meters measure light intensity as perceived by

the human eye. The eye perceives light of approximately

560 nm most strongly, with perception half that at 500 and

600 nm.

The meters display values in the range 0-1999. This must be

multiplied by 10 to obtain Foot-Candles, so the meter range

is 0-19,990 Foot-Candles. Since 1 Foot-Candle is equivalent

to approximately 10.8 lux, multiplying the meter reading by

108 will compute lux.

Foot-Candles

Because the detected light intensity is dependent on the an-

gle of the incoming rays, the sensor must be constructed to

minimize this error. This is called cosine correction because

the radiant intensity of the incident light is dependent on the

cosine of the angle between the sun and an imaginary verti-

cal line extending from the ground. The PAR light sensor is

designed to give accurate readings over a wide range of solar

position. This is accomplished by recessing the photodiode

and building a protective diffuser that scatters the light in

such a way that the sensor output is accurate. The following

chart shows the cosine response error as a function of the

solar angle. This error compares favorably with other com-

mercially available sensors.

Cosine Correction

-30.00

-25.00

-20.00

-15.00

-10.00

-5.00

0.00

5.00

10.00

15.00

20.00

0 5 10 15 20 25 30 35 40 45 50 55 60 65 70 75 80

Error %

Zenith Angle

Cosine Error for Different Light Sensors

Spectrum Solar Radiation Sensor

Spectrum PAR Light Sensor

Competitive Sensor A

Competitive Sensor B

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.

Range 0-1999 µmol/m2s, ±5%

0-19,990 foot-candles, ±5%

Cosine Correction ±3% at 45°

±7% at 80°

Sensor Dimensions 2"x1"x1" (5cm x 2.5cm x 2.5cm)

Cable Length 66" (26 cm)

Specifications

3600 Thayer Court

Aurora IL 60504

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

Fax (815) 436-4460

E-Mail: info@specmeters.com

www.specmeters.com

R 04/23

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