| 摘要 |
PURPOSE: A traffic signal light is provided to reduce the changes of illumination in response to the changes of temperature. CONSTITUTION: A signal light includes a light source for utilizing a light emitting diode as a major display light source, a sensing block for detecting a temperature around the traffic light signal or an internal temperature and an electronic circuit block for increasing or for decreasing the current supplied to the light emitting diode in response to the value of the sensor. In the device, the circuit gradually and continuously changes the current.
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