Abstract: In a light emitting diode (LED) chess set, when a chess piece of the chess set is placed on a chessboard, a power supply element in the chessboard will supply power to an LED in the chess piece to emit light, so that the chess piece gives a light emitting effect. When a player removes a chess piece from a square of the chessboard for a next movement of the chess piece, a control element in the chessboard will identify an identification element of the chess piece through a sensing element on the square to determine the possible next movements of the chess piece on the chessboard and drive the LEDs in the corresponding squares of all suggested movements to emit light. The light-emitting square guides and suggests players to make the next movement of a chess piece and improve a beginner's memory on the rules of chess.

Abstract: A method for continuously projecting images by enabling an apparatus including a light source, an image creation unit, and a projection unit includes receiving video signals from a predetermined source; creating a plurality of images from the video signals while being impinged by light emitted by the light source; receiving the images from the image creation unit; and activating the projection unit to project the images on a projection screen in a predetermined rapid succession so as to create a motion picture effect. As such, lighting adjustment and natural beauty simulations in a vivid way can be achieved.

Abstract: A lamp unit includes a power cord having a mating plug at one end and a corresponding mating plug at the other end, a bulb seat, an LED holder, an LED, and a housing. The LED is mounted on the LED holder in a watertight fashion and the LED holder is mounted on the bulb seat in a watertight fashion so as to prevent water from getting in the bulb seat. The LED can be replaced with another LED capable of emitting light of different color. The housing can be replaced with another housing of different shape. The corresponding mating plug of one lamp unit is adapted to connect to the mating plug of another lamp unit so as to form an LED light string for decoration of any desired length. The invention is highly adaptable to be employed in different environments and events.