Owner’s Manual | Model A704-5 Aviation Lighting System
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© 2008 Carmanah Technologies Corporation
Last revised: April 2008
4.3.3 Automatic Light Control (ALC)
Automatic Light Control (ALC) is a patented algorithm that allows the light to adjust its energy
consumption to the amount of sunlight available to charge the batteries. This ensures the light will
continue to operate through periods of limited sunlight.
ALC is always enabled in the Model A704-5 for Autonomous Modes and it is not user configurable. ALC
is disabled for Temporary High-Intensity Modes.
These thresholds are not to be confused with battery state-of-charge thresholds.
Table 4-6: ALC Dimming Levels
State of Charge
ALC Dimming Level
60% - 100%
100% intensity
50% - 60%
75% intensity
40% - 50%
50% intensity
0% - 40%
25% intensity
4.3.4 24-Hour Shutoff
If the Model A704-5 senses ambient light levels of 30 lux or less for 24 consecutive hours, it will assume it
is being stored and automatically enter Ship Mode to preserve the battery. The ambient light thresholds
are set so that a very dark winter season will not cause the Model A704-5 to enter Ship Mode
unintentionally.
The A704-5 will still charge while in Ship Mode as long as sunlight is available or if
external power is connected.