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Old 09-07-17, 10:41
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petrochemist petrochemist is offline  
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Join Date: Nov 2010
Location: Clacton, Essex
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Sounds like a challenge.
I've seen DIY versions of the 'better beamer' flash extended that might suit the job. Basically a large Fresnel lens, on a reflective cone. The distance & focal length of the lens being chosen for the distance the beam needs to travel...
Another option might be to get you light closer to the waterskier. If you can arrange powerful LED lighting in a waterproof enclosure fastened to the ski rope, it should be possible to add some light that way.
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