Lighted nocks are apparently legal in nearly every state except Idaho. For those who don't bow hunt, like me, they are a way for bow hunters to find their arrow and their big game when shot. One hunter is looking to get them legalized.
Every state has their own weird set of laws that have been on the books for so long that they have become strange or no longer have relevance. These Idaho laws may be strange, but you still have to follow them.