Well, well… Just copy Skilhunts H300 head with side switch, no integrated charger, no T shape PCB, no inner shelf for led star, no grip on tube to reduce overall weight .Keep weight <50gr. Use popular TIR optics for manual replacement. Make buck or boost driver with simple UI with 4-5 main modes , separated firefly and turbo. High mode 3-4W, turbo 10-12W. Do not overpower turbo mode and so on … aand sale it for less price of skilhunt. Do it properly, don’t waist materials 
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