| 摘要 |
A lighting system has an array (100) of at least one light-emitting solid-state element such as a light-emitting diode (LED) or a laser diode. A voltage source (10), which may supply either alternating or direct current, energizes the array. Array state circuitry (125; Q2, R2), electrically connected in series with the array (100), senses at least one state of the array, such as the amount of current passing through the array, or temperature. Secondary circuitry (127; R1, Q1; 200, 201, 202; 200, R4, Q1; 126, 127) is connected in parallel with the array (100). A switching component (Q1; Q1, Q3; 202) adjusts the current passing through the secondary circuitry in accordance with the sensed state of the array such that current through the array is maintained substantially constant. A third, parallel, excess current shunt path may also be provided, in which case so is excess current shunt circuitry, which senses current flowing in the secondary circuitry and shunts current in the secondary circuitry in excess of an excess current threshold to the excess current shunt path, whereby overflow current above a first threshold for the array (100) is shunted away from the array and excess current above a second threshold is shunted from the secondary circuits to the excess current shunt circuitry. A wide-angle mounting arrangement is also provided for the array.
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