The invention provides a self-adaptive lighting circuit control method, a lighting circuit and a handheld lighting lamp. The self-adaptive lighting circuit control method comprises the steps that whether a
human body signal exists in an
irradiation range or not is judged through a
radar detection module; when
human body signals exist in the
irradiation range, the environment
light detection module judges the environment condition, when the
light intensity is low, the environment condition is night, and when the
light intensity is high, the environment condition is
daytime; when the environmental condition is
daytime, the lighting module is kept closed; and when the environmental condition is night, turning on an illumination module, reducing the duty ratio of an illumination brightness
signal according to the
human body induction
signal, and reducing the illumination brightness of the output light of the illumination module. Whether human body signals exist in the
irradiation range or not is judged through the
radar detection module, then the environment condition is judged through the environment
light detection module, the working state of the
internal lighting module is adjusted according to environment changes before and during handheld lighting work, and therefore harm of output light to human eyes is reduced.