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I was reasonably happy with the results I got using this dive light which uses a standard size LED element: UltraFire WF 3430 Diving Diver Scuba CREE T6 Flashlight | eBay
And replacing the white LED with a UV light element: 3W 395nm UV Blacklight Ultra Violet P60 Style Drop in LED Light Bulb | eBay
And replacing the white LED with a UV light element: 3W 395nm UV Blacklight Ultra Violet P60 Style Drop in LED Light Bulb | eBay