Light bulb with fixed structure

A light bulb with a fixed structure, the light bulb comprising:

• a light source board;
• a light allocation item;
• and
• a light bulb shell, wherein the light allocation item is set on the light source board to change the spread of the light coming out from the light source board, the light bulb shell is set around the light source board and the light allocation item, the light bulb shell has a bottom edge setting on a bottom of the light bulb shell, the bottom edge is set around the light source board, the light allocation item has a pressed device, the pressed device is made of an elastic ingredient, the pressed device reaches outside of the light source board forming an groove below the light allocation item for a portion of the bottom edge of the light shell to be inserted into the groove to press the bottom edge of the light bulb shell so that the portion of the bottom edge inserted into the groove and the pressed device form a fixing structure to fix the light shell to the light allocation item.