How many type products of LED circuit builder?

How many type products of LED circuit builder?
This post will show you the type of LED circuit builder.
First of all Allen wants to claim we just list the normal product.
If you want Allen add new type products of the LED circuit builder, please let me know.

Some LED circuits explained examples from various projects: flashing LEDs, 220V LEDs and more.
Above two types were the normally LED circuit products.
But to LED circuits builders or LED circuit board designer must know more electronic knowledge.
You must make some calculations to figure out the resistor value, depending on voltage power supply, LED voltage drop and desired current.
How many type products of LED circuit builder?