How many lumen is required?

How many lumen is required from a flashlight to dazzle someone long enough to leg it?

Do I need 500 or less or 1000+ is the more the merrier or is there a cut off point in temporarily blinding someone?

I'm not looking for a specific model, there are lots to choose from in the UK but I need to know how much is required.

Thanks in advance

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How many lumen is required?