There are several types of crystal lamps: Natural crystal cutting molding chandelier, heavy lead crystal blow plastic chandelier, low lead crystal blow plastic chandelier crystal glass mid-range shape chandelier, crystal glass pendant chandelier, crystal glass die-casting cutting shape chandelier, crystal glass bar chandelier and so on. Most of the crystal lamps on the market are made of imitation crystals, but imitation crystals use different materials, good quality crystal lamps are made of high-tech materials, and some of the best crystal lamps and even plastic as imitation crystal materials, light and shadow effect is naturally very poor. Therefore, in the purchase must be carefully compared, carefully identified. Generally commonly used crystals have two kinds of k5,k9.