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The Uniquefire 1504 has been around for years, many people own it. I've put in a chinese made LED, 5050 size 20 watts which performs very well compared to LED's from leading manufacturers. Using a 16 mm driver BLF A6, and a llithium ion cell 26650 size from Shockli. Lumen output at maxium in this setup is aproximately 1600 lumens. Throw measured on google maps is 2500 meters (1.55 miles or 2.5 kilometers ). The led is built slightly different from the Yingding 5050, but output is the same.
*Turbo measured 5.3 amps, then adding spring bypas s (second path) to driver and tail switch, turbo measures 5.6 amps.