Tutorial how to create your own flares and leaks (in English):
How do I use the flares & leaks in Photoshop (in German):
Photoshop Flares vs. external Flares (in German):
How can I produce leaks in Photoshop if I don’t have external or natural ones:
(Video is in production)
You can download my produced flares and leaks here. They are all for free and RAW files. So you have maximum creativity to play with them around and use them for any production you want.