Lumen is designed to build blazing fast micro-services and APIs. For example, if there is one aspect of your Laravel application that receives drastically more traffic than the rest of the application, you may choose to build that aspect of the application as a small, separate Lumen application.

http://lumen.laravel.com/docs/introduction

Developing a web application with Lumen and MySql
Lumen seems to be a very promising framework for the fast prototyping of small web apps.
http://loige.co/developing-a-web-application-with-lumen-and-mysql/