The luminescent properties of the phosphors and LED chips are directly affected by the working current and junction temperature.This influence may lead to color shift during dimming process of the white-light LED.In order to investigate the color-shift mechanism of w hite-light LED,colorimetric parameters of the LED are measured at linear and pulse width modulated (PWM) di ming modes.It is found that PWM dimming offers better color stability;A raising temperatu re reduces the phosphor conversion efficiency;The matching degree between the blue light and phospho r is disturbed by the raising peak current.To minimize the color shift over dimming,a new PWM dimming mode with adjustable peak current is proposed.When the correlated color temperature is higher than t he set value,it can be reduced by reducing the peak current and extending the duty cycle.Conversely,by increasing the peak current and shortening the duty cycle,the correlated color temperature can be i ncreased when it is too low.It is shown experimentally that by using this dimming mode,the color shift caused by the change of phosphor conversion efficiency can be successfully compensated at PWM dimming with adjustable peak current,leading to a color temperature change of less than 33K in the dimm ing range.Finally,the relationship between the target correlated color temperature and the color stabi lity range is discussed.