Patent ID: 8143789

Claim:
An illumination system comprising: an LED lamp; a power source; a timer; a humidity sensor; a controlling circuit; and a driving circuit; wherein the power source, the timer, the controlling circuit and the driving circuit are electrically connected to the LED lamp, and wherein the timer produces different signals to the controlling circuit at different times to thereby drive the LED lamp to illuminate a road with different brightness; wherein the LED lamp comprises two type LEDs which respectively emit cold light and warm light, the LED lamp selectively producing only one of the warm and cold light each time; wherein the humidity sensor is electrically connected to the LED lamp for switching the LED lamp between the warm light and the cold light via the controlling circuit in response to a humidity of environment; and wherein the humidity sensor drives the LED lamp to emit the warm light when rain or fog in the environment is detected by the humidity sensor, and drives the LED lamp to emit the cold light when other weather conditions are detected by the humidity sensor.