Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Light
TP_IF_LIGHT_LIGHTParameter: Threshold
TP_IF_LIGHT_THRESHParameter: Color On
TP_IF_LIGHT_COLONParameter: Color
TP_IF_LIGHT_COLORParameter: Color Variation
TP_IF_LIGHT_COLVARParameter: Position
TP_IF_LIGHT_POSITIONParameter: Animation Time
TP_IF_LIGHT_ATIMEParameter: On
TP_OUT_IF_LIGHT_ONParameter: Intensity
TP_OUT_IF_LIGHT_INTENSITYParameter: Color
TP_OUT_IF_LIGHT_COLOR