Barricade flasher
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United States of America Patent
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Mar 16, 2010
Issued Date -
N/A
app pub date -
Feb 25, 2004
filing date -
Feb 25, 2003
priority date (Note) -
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Abstract
A flashing warning light apparatus wherein there is provided one or more light-emitting diodes, the light-emitting diode being driven in a pulsed manner to achieve light output at a selected flash rate, with control means adapted to detect any light-induced signal from the same light-emitting diode or diodes during periods when the light-emitting diode is not emitting light, said signal being dependent on the level of ambient light. The same diode or diodes can be at a focus center of a reflector. A magnitude of any signal can then be used to determine whether the ambient light is such that the warning light should operate.
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