Patent ID: 7825611

Claim:
An illumination adjusting device for receiving power from a power supply and supplying output voltage to a lighting unit, comprising: a selector for realizing a plurality of selections comprising a plurality of predetermined illumination intensity ranges, and generating a corresponding level signal according to a selection of a predetermined illumination intensity range; a detector for detecting ambient illumination intensity and generating an ambient illumination value according to the ambient illumination intensity; a comparator for comparing the ambient illumination value with a predetermined value of the selection of the predetermined illumination intensity range, the comparator outputting a first power signal when the ambient illumination value is lower than [a]the predetermined value of the selection of the predetermined illumination intensity range; and an adjustor for outputting a corresponding output voltage to the lighting unit in response to the level signal from the selector, and adjusting the output voltage according to the first power signal, wherein light emitted by the lighting unit is controlled within a predetermined illumination intensity range.