Patent ID: 8342725

Claim:
A light bar comprising: a plurality of light heads, each light head comprising: a heat sink, a circuit board in heat transfer communication with the heat sink, said circuit board having an electrically conductive pathway, a chip-on-board (COB) light emitting diode (LED) mounted directly in contact with the circuit board such that heat generated by the COB LED when energized is transferred to the circuit board, said COB LED having an LED chip electrically connected to the electrically conductive pathway of the circuit board, an optical concentrator mounted adjacent to the COB LED to capture light emitted by the COB LED when energized and to transmit the captured light, wherein the optical concentrator is a compound parabolic concentrator (CPC), an optical collector adjacent the optical concentrator to receive and transmit light from the optical concentrator, and an optical collimator adjacent to and spaced apart from the optical collector to receive and transmit light from the optical collector, such that light transmitted out of the optical collimator is a spatially uniform beam, and an optical diffuser adjacent to the optical collimator to receive the spatially uniform beam of light transmitted out of the optical collimator and produce an output light pattern that is substantially rectangular and horizontally diverging at a horizontal angle which is greater than a horizontal divergence angle of the spatially uniform beam; a transparent housing enclosing the plurality of light heads; and a microcontroller electrically connected to each of the COB LEDs to energize each of the LED chips of the plurality of light heads so that the combined output light patterns of transmitted light from the plurality of light heads creates warning light signals that are substantially rectangular and horizontally diverging at a horizontal angle which is greater than a horizontal divergence angle of the spatially uniform beam when viewed by an observer remote from the light bar.