What's the Difference Between 3528 vs 5050 vs 5630 LED SMD Diodes

http://heracolights.com/2014/03/10/3528-vs-5050-vs-5630-led-smd-diodes/
What's the Difference Between 3528 vs 5050 vs 5630 LED SMD Diodes
The answer is simple, really. Those numbers refer to the surface area of the SMD (Surface Mount Diode). The first two digits represent the width and second two represent the height (both have imaginary decimals between them). The next question is: are 5630 LEDs brighter than 5050 and 3528 LEDs? What is the brightest LED type?