This tutorial explains how to use lights in Maya and also how to emit light from an object such as the Sun or a light bulb (so that it glows). Please note that this video is a basic overview to get you started with some of the many lights and lighting effects you can use in Maya. You can also download printed instructions here.
Adding light decay
You can download the instructions from here if you would like light in your project to lose its intensity or reach over a distance.