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English
3.2 Connecting to LI-180 Spectrometer Software
Install LI-180 Spectrometer Software
Visit the LI-COR Support Site to download the LI-180 Spectrometer
software on your PC (www.licor.com/env/support).
Then, connect
it to the spectrometer using the USB cable to control the instrument
and save data on your PC.
Set USB PC connection mode
LI-180 Spectrometer
Install file
Select “OPTION”. Select “USB mode”. Select “PC connection”
and press “Yes”.
USB connection
LI-180 Spectrometer
PC software
Measure
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4.1 Variable Definitions
Abbreviation
CCT
The color radiated by a black-body radiator under different temperatures.
CCT has the color that is the closest to the ideal black-body radiator.
CRI (Ra)
The average value of R1 ~ R8, where R1 ~ R8 represent the value of eight
standard colors as defined by Commission International de l'Eclairage (CIE).
A CRI value of 100 indicates the best quality of light for rendering color
appearance, while a value of 0 indicates the worst quality of light for
rendering color appearance.
R1, R2, ... , R15
Represents the quality of the light source with the indexes corresponding to
15 standard colors, including: R1: light grey-red; R2: dark grey-yellow; R3:
saturated yellow-green; R4: middle yellow-green; R5: light yellow-green; R6:
light blue; R7: light purple-blue; R8: light red-purple; R9: saturated red; R10:
saturated yellow; R11: saturated green; R12: saturated blue; R13: white skin
color; R14: leaf green; and R15: yellow skin color.
Lux
Light flux received by each unit area.
λp
Wavelength with the highest intensity in the measured spectrum.
λpV
Intensity of the peak wavelength in the measured spectrum.
λd
Used to express the color of the measured light. May be hybridized by the
spectrum color of the wavelength and the standard illuminant E(x, y = 0.333,
0.333).
I-Time
Integration time measured by the spectrometer.
x, y, X, Y, Z
Light color with 2-dimensional plane coordinates (x, y) as defined in CIE
Chromaticity Chart CIE1931.
u',v'
Light color with 2-dimensional plane coordinates (u', v') as defined in CIE
Chromaticity Chart CIE1976.
Full Name
Correlated Color Temperature
Color Rendering Index
Color Rendering Index Varieties
Illuminance
Peak Wavelength
Peak Wavelength Value
Dominant Wavelength
Integration Time
CIE1931 Chromaticity Chart Color Coordinates
CIE1976 Color Coordinate
Unit
K
lx
nm
mW/m
2
nm
ms
