Parameters are accessed with C4DAtom::GetParameter()/ C4DAtom::SetParameter(). See Parameter IDs.
Parameter: Light
TP_IF_LIGHT_LIGHT
Parameter: Threshold
TP_IF_LIGHT_THRESH
Parameter: Color On
TP_IF_LIGHT_COLON
Parameter: Color
TP_IF_LIGHT_COLOR
Parameter: Color Variation
TP_IF_LIGHT_COLVAR
Parameter: Position
TP_IF_LIGHT_POSITION
Parameter: Animation Time
TP_IF_LIGHT_ATIME
Parameter: On
TP_OUT_IF_LIGHT_ON
Parameter: Intensity
TP_OUT_IF_LIGHT_INTENSITY
Parameter: Color
TP_OUT_IF_LIGHT_COLOR