Product Manual

Turf-Tec International Daylight Indicator – Light Meter - Copyright 2013
Page 4 - www.turf-tec.com
DLI Display Mode
After 24 hours of continuous operation, the device will stop accumulating light
measurements. One or more LEDs will flash every second for one hour to indicate the
Daily Light Integral (DLI) for that location. The device will shut itself off after displaying
the DLI value for one hour, but the DLI measurement will be retained in memory.
The last DLI value computed can be retrieved from memory by pressing the power
button to turn on the unit. The DLI value will flash every second for 10 seconds.
*Important*
After 10 seconds the Daylight Indicator value will be erased, and a new 24 hour
measurement period will begin. Pressing the button again before 10 seconds
has elapsed will turn the unit off and save the DLI value.
Reading the Display
The Daylight Indicator - Light Meter has 4 LEDs that are used to indicate different levels
of light - both intensity and Daily Light Integral (DLI). The LEDs flash once every four
seconds during the Light Gathering Period. Numbers to the left of the LEDs indicate the
current light intensity in μmolm
-2
s
-1
(micromoles). A sunlight approximation of foot
candles can be obtained by multiplying the value by 5. Numbers to the right of the LEDs
are used to display the DLI value in molm
-2
d
-1
. The LEDs flash once per second.
One LED
When one LED is flashing, read the number next to it. The light level will be at least that
number. In the image to the right:
During the Light Gathering period, by reading the left numbers, the light
intensity would be in the range 1000- 1499 μmolm
-2
s
-1
(“1000” is lit,
and the top of the range is less than
1500, the next number up). In DLI Display mode, by reading to the right,
the DLI value would be in the range 20-29 molm
-2
d
-1
Two LEDs
If the light level is between two LEDs, then
both flash. In this case, use the number between
them.
For the image to the left:
During the Light Gathering period, by reading the left numbers, the
light intensity would be in the range 750-999 μmolm
-2
s
-1
(“750” is
between the two lit LEDs, and the top of the range is less than
1000, the next number up).
In DLI Display mode, by reading to the right, the DLI value would
be in the range 15-19 molm
-2
d
-1
Four LEDs
Under the highest light levels, all four LEDs flash. The numbers at the top of the display
(1500+, 30+) provide the “at least” values for these light levels.