Color-changing lampshade and lamp

A lamp, comprising:

• a lamp body radiator;
• a light source;
• a color-changing lampshade;
• and
• a circuit system,
• wherein:
• the color-changing lampshade comprises an upper cover enclosing a light outlet, a waterproof ring provided on and spaced from one side of the upper cover and extending along a periphery of the upper cover, a substrate being a transparent component and provided with a first side and a second side opposite to the first side, and a color-changing coating provided corresponding to a position of the light outlet and coated on the second side;
• the upper cover is configured to extend along a periphery of the substrate, lean against the first side, and press the substrate against one side of the waterproof ring;
• the color-changing coating is an electrochromic film configured to be opaque, dark or matte when not powered, and be transparent when powered;
• a mounting cavity is formed in a recess on one side of the lamp body radiator, and the light source is mounted in the mounting cavity;
• a light-emitting side of the light source is provided in a direction away from the lamp body radiator, and the upper cover is detachably mounted on the lamp body radiator;
• the light outlet is provided corresponding to the light-emitting side of the light source;
• the waterproof ring is provided on the lamp body radiator along a periphery of the mounting cavity, and the substrate is mounted on the mounting cavity corresponding to the light-emitting side of the light source;
• an outgoing light emitted from the light-emitting side of the light source passes through the color-changing coating to form a color-changing light, and the color-changing light is emitted from the light outlet through the substrate;
• the circuit system comprises a control switch circuit configured to generate a control signal according to a light color change requirement, a signal recognition circuit configured to recognize a valid control signal and suppress an invalid signal, a drive circuit configured to provide a stable voltage/current to the light source and the color-changing coating, and a current control circuit configured to adjust the voltage/current input to the color-changing coating according to the control signal of the control switch circuit;
• and
• a color change state of the color-changing coating is controlled by the presence and magnitude of an input voltage/current.