I am getting one of these. You can use this from an iPhone using the Lumecube app. The light has a photo cell which enables you to slave it to the flash on your phone, or snap and shoot camera, and with other Lumecubes. Plus it is water proof to 100 feet of water. $79.95 each.
https://www.lumecube.com/shop/lume-cube
https://www.lumecube.com/shop/lume-cube
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