NuFletch Ignitor Lighted Nock Replacement Battery/LightNuFletch Ignitor Lighted Nock Replacement Battery Light he Ignitor Replacement Light is used in all of the NuFletch Ignitor Lighted Nocks and are super easy to swap out. The Ignitor's utilize an Ultra LED that is super bright and uses minimal power which gives the Green LED 50 hours of light and then the Red LED actually absorbs more light faster which in the same battery only gives you about 15 hours of light. Works in all Ignitor Nocks!