Pixel led Rainbow controller is a very popular controller for mandap decorations 

this controller is available in Two types of matrix format

1. 12×24 (one line contain 12 led and the total number of line 24 )
2. 20×20 ( one line contain 20- led total number of line 20 )

Now it depends on you what size you want both videos are available in below 

if you want your own customized size then contact us on WhatsApp

This project is made with Two Types of Pixel led

1. WS2812 led strip
2. WS2811 led

for small projects use WS2812 Types of led  approx 1×1 foot types projects-ready from the strip

and for big projects use WS2811 Types led I use 3×3 foot poly sheets for these projects

Note:- 

Both Types of Pixel  led (WS2811, WS2812 ) work with these Rainbow controllers

12×24 led rainbow projects needs at least 5 volts 10 ampere SMPS

20×20 led rainbow projects needs at least 20 ampere SMPS