Hi…..friends here i will show how create a stock vector illustration 3d flashing lights images.
In this tutorial you will learn how to create a flashing lights quick and easy.
[1]-Choose the Chamfer cylinder and create Chamfer cylinder with the following size
Apply the Taper modifier with the good following amount as shown below 
[2]-Place Chamfer cylinder like me 
[3]-Convert the chamfer cylinder into the editable now select the polygons
Apply the extrude polygons with the amount of 2.0 
[4]-Your object should like this 
[5]-Create another chamfer cylinder and place like me 
[6]-Create sphere with the following size and place like me 
[7]-Select the edges and apply the chamfer edges with the amount of 0.11
[8]-Use the material setting as shown below 
[9]-Similary create all three materials like me 
[10]-Now you are done it enjoy the final output as shown below 