Cycles rendering dim lighting This has been going on for a while now but I just want to fix this. 

I have a nice bright scene in the viewport, but then when I render it, it looks way too dark.

Here is the .blend https://drive.google.com/open?id=1a7bX40YrLo2u1lplQ9KYhogwmmlm3XqG
I downloaded i tried your mesh. Number 1, if possible use a surface below the object. That way a lot more light bounces and illuminates it. Number 2, you might want to switch your "Color Mangement - View transform - to Filmic (instead of film". Its giving nice results over hear.