Light-emitting diode driving apparatus and light-emitting diode illumination system using the same

A LED illumination system, comprising:

• a LED lamp, having at least a first power specification and a second power specification different from the first power specification;
• and
• a LED driving apparatus, coupled to the LED lamp, wherein the LED driving apparatus comprising:
• a driving circuit, providing an adjustable output current for driving the LED lamp having the first power specification;
• an output detecting circuit, coupled to the driving circuit and the LED lamp for detecting a driving voltage of the LED lamp to generate a first detecting signal, wherein the driving circuit drives the LED lamp under a constant current in response to the first detecting signal;
• and
• an output adjusting circuit, coupled to the output detecting circuit, wherein the output adjusting circuit is controlled to adjust a signal level of the first detecting signal, such that the adjustable output current has at least one current adjusting range for driving the LED load having the second power specification.