How many types of led lights are there? How many categories are there!

Through-hole LED Classification:Tower LED、Round LED、Cylindrical LED、Rectangular LED、Oval LED、Super Flux LED、Multi-Color LED

SMD LED  Classification:Single Color Chip LED、Single Color PLCC LED、Multi-Color SMD LED、White SMD LED、Reverse Mount Chip LED、Right Angle Chip LED

LED Display Classification:7-segment Display、SMD 7-segment Display、Dot Matrix、Alphanumeric、Light Bar、Graphic Display、LED Backlight