Downlight apparatus

A downlight apparatus, comprising:

• a tube body, having an opening and a terminal portion opposite to the opening;
• a driver plate disposed on an exterior surface of the terminal portion of the tube body;
• a light source plate disposed on an interior surface of the terminal portion of the tube body, the exterior surface and the interior surface being opposite to each other, the light source plate being heat conductive to the terminal portion, the driver plate being electrically connected to the light source plate via a hole of the terminal portion of the tube body;
• a detachable attaching structure disposed in the opening of the tube body;
• and
• a set of replaceable reflective cups for being selected and detachably attached to the detachable attaching structure, the set of replaceable reflective cups have different reflective characteristics for guiding light of the light source plate to render different luminous effects, wherein at least one reflective cup has a first reflective part and a second reflective part, the first reflective part have multiple first segments and the second reflective part have multiple second segments, each first segment is extended from a top opening of the reflective cup to a bottom opening of the reflective cup along a main light direction from the light source plate, each second segment is extended from the top opening of the reflective cup to the bottom opening of the reflective cup along a main light direction from the light source plate, the multiple first segments and the multiple second segments are arranged alternatively, the first reflective part and the second reflective part have different reflective parameters, wherein at least one reflective cup has mixed colors.