Simple!

Just put an omni in your scene, you can even just lower it's settings to be invisible and not interrupting or affecting your scene.

You will need to apply an affect to it.
Go to the upper menu tab and search for enviorment>effects and Click add lens flare. then it should say somewhere beneath ''Pick Light''. So your omni should be visible in that list or just select it through a viewport. Then you can use the setup button for that to adjust your preferences for it such as colour, streaks and brightness. hit render and after it's done renderning a sun flare should appear where the omni is.

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ok I found!
Thanks a lot my friend!

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No problem man!

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