Below are a few Photoshop light effect tutorials that have caught my eye while looking over the tutorial sites, for me these produce the best results while using brushes, blurs and other media such as textures to create a top quality effect.
Create Awesome Abstract Nebula Circle Shape in Photoshop
Covers using filters with textures such as the twirl filter and warp filter with a Nebula star texture making for impressive results.
Create a Colorful Aged Poster With Special Lighting Effects
You’ll learn how to use texture and adjustment layers to create an aging effect on a colorful abstract poster design.
Create a Surreal Girl with a Raven Composition in Photoshop Tutorial
Loads of great tricks in this tutorial. If you want to take your creative composition skills to the next level, this Photoshop tutorial is perfect for you as it involves illustration, textures and Photoshop.
The Making of “Constant Slip”
This is more a process description of making this illustration, than a detailed step by step how to, but is very detailed and can lead to some very creative ways of achieving light effects.
Achieve Brilliant Lighting Effects in Photoshop
Using default brushes, blending options and a few stock images, you’ll learn step by step a variety of techniques that you can use in your own digital artworks to achieve professional results.
Add Brilliant Light Effects to Your Work with Photoshop
Several super easy techniques for incorporating remarkable light effects to your work using Photoshop. Including making your own set of abstract brushes and working with textures.
Create a Cosmic-Inspired Dreamy Scene in Photoshop
A demonstration of how to use stock photography, 3d elements, and various techniques to create a cosmic-inspired Photoshop master piece.
Create A Gorgeous Light Effect Using Photoshop
Using soft brushes and smoke textures allows you to create simple yet effective light effect all is explained.
Creating a Surreal Smoking Bird Composition in Photoshop
Making a monochromatic scene with the subject being a bird with smoke surrounding its body. Using a high contrast stock image combined with smoke brushes.
How to enhance your subjects with striking light effects in Photoshop
A simple technique that can be used to enhance any kind of subject with stunning light effects. Using a particular selection tools, gradients and brushes to achieve the result.
MSNBC New Background Design in Photoshop
Plenty and blur effects and colours to create a simple vibrant background.
Show me the light digital art tutorial
How to use stock images to make a beautiful digital artwork with nicely colored lights, All you need for this tutorial is the provided colors in Motion textures pack and a model.