Light-emitting diode lighting device having multiple driving stages and line/load regulation control

A light-emitting diode (LED) lighting device having multiple driving stages, comprising:

• a first luminescent device driven by a rectified alternative-current (AC) voltage for providing light according to first current;
• a second luminescent device coupled in series to the first luminescent device and driven by the rectified AC voltage for providing light according to second current;
• a voltage detector configured to monitor a variation in a peak level of the rectified AC voltage and generate a compensation voltage associated with the peak level of rectified AC voltage;
• a first current controller coupled in parallel with the first luminescent device and configured to:
• regulate the first current so that the first current does not exceed a first current setting;
• and
• adjust the first current setting according to the compensation voltage;
• and
• a second current controller coupled in series to the second luminescent device and configured to:
• regulate the second current so that the second current does not exceed a second current setting;
• and
• adjust the second current setting according to the compensation voltage.