Red lens covers take away too much light so I don't use them. Just shine about every eight to ten minutes, and if you do get one to come in, don't blind it with the light. Get setup to shoot in the dark then shine it again and shoot. They get blinded by it and have to look away. Make sure you do plenty of looking around when you get up too, that's when you're most likely to catch them sneaking away from your stand. Don't be afraid to use your light, but don't have it on nonstop either- you'll drain the battery-