Birthday candle with automatic lighting effect

A birthday candle with an automatic lighting effect, comprising:

• a candle body (1) made of paraffin wax;
• a wick (11) made of flammable material, connected to the candle body with an upper end thereof protruding outside an upper end of the candle body;
• a light sensor (5) fixed in the candle body at a position close to the wick and configured for detecting light generated by the wick when the wick burns;
• a light source (2);
• and
• a control circuit board (4) electrically connected with the light sensor and the light source, and configured for controlling the light source according to signals output from the light sensor;
• wherein the control circuit board turns on the light source once the wick burns and turns off the light source once the wick is extinguished;
• wherein the candle body defines a hollow channel (12) that extends from the bottom up;
• an upper end of the hollow channel is under a lower end of the wick;
• the hollow channel has an opening (13) at a bottom end thereof, the light source is located at the opening and an irradiation direction of the light source is directed toward the interior of the hollow channel;
• wherein a height of the wick is less than half a height of the candle body.