Note about led fixtures – ETC Source Four LED v1.6.0 User Manual User Manual
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Source Four LED Profile v1.6.0 User Manual
Note About LED Fixtures
All LED sources experience some lessening of light output and some color shift over time.
Source Four LED Profile fixtures have complex thermal management systems to minimize
these changes. With typical usage, a Series 1 fixture will still achieve at least 70% of its
initial output after 50,000 hours of use (B50, L70). A Series 2 fixture will achieve 70% of its
initial output after 25,000 hours of use (B50, L70). In individual situations, LEDs will be used
for different durations and different levels. This can eventually lead to minor alterations in
color performance, necessitating slight adjustment to presets, cues, or programs.
All LEDs may exhibit a slight shift in output as they rise to full operating temperature. Source
Four LED Profile fixtures allow the selection of different power settings in order to balance
the competing requirements of thermal stability and brightness. Depending on the selected
setting, changes in output as fixtures warm up may or may not be visible to the eye.
Color Rendering Index and Color Quality Scale Ratings
Source Four LED Profile fixtures are evaluated for Color Rendering Index (CRI) and Color
Quality Scale (CQS) performance using measured output spectrum and optimized mix
solutions for a best spectral match to black body sources at 3200K and 5600K. Color fidelity
was also measured. These numbers may fluctuate slightly from fixture to fixture. This is a
normal characteristic of white LEDs, and this kind of variation is highly unlikely to be
apparent in most applications. The performance is the same for all fixture versions.
Source Four LED Profile luminaires provide excellent color rendering, particularly the color-
mixing versions. A Duv rating of 0.000 indicates that the color mix used was exactly on the
black body line, with no green or magenta tint.
Daylight and Tungsten fixtures use only white-type LEDs at a fixed color temperature in
order to maximize output and efficacy.
Fixture
CRI
CQS
Color Fidelity
Duv
Lustr+ Reg at 3200K
84
87
87
0.000
Lustr+ Reg at 5600K
92
92
92
0.000
Series 2 Lustr at 3200K
86
88
88
0.000
Series 2 Lustr at 5600K
90
91
91
0.000
Studio HD at 3200K
94
95
93
0.000
Studio HD at 5600K
91
87
86
0.000
Tungsten at 3000K
86
86
86
0.001
Daylight at 5600K
71
70
69
0.001