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Convoy C8, (led of your choice), 8*7135 driver.
www.aliexpress.com/store/product/Convoy-c8-strong-light-flashlight-cree-xml-u2-t6-torchy/330416_826040641.html
Flashlight parts:
Thorfire VG10—Not the brightest—$15.00 with code
BLF Code deals:
I think ready made would be the cheapest option for you. However you are the decider.