I was following some links on another Black Powder forum and the subject of bore lights came up. Turns out there is a much less expensive solution to the lighted arrow nocks. These are on Amazon for $10 for 24 and will fit 50cal and up and that's right up the Black Powder alley. At this price, I can afford to keep a couple in about every range box, ammo box and pouch I own.
Amazon product ASIN B01FF00TIW
Amazon product ASIN B01FF00TIW