I was able to use the nockturnal this morning at almost 10 am and worked great even in full sun and saw the exact impact point as the deer ran away the nock was as bright as can be stuck in a corn stalk. After a short tracking job recovered my 1 st deer of a great season. Best thing is you don't have to worry about if its going to work or not and it's Awsome when you see that red nock slip through the exact point when you release.