This is a prime example of the unwritten rules. Everybody knows to be in the woods before daylight but it isn't a law. On public land it is more important because of the various amounts of hunters involved but on private land it is just a good idea. When I'm running what I call a little late, I will use alot more caution a noise control heading in than I normally would at 4:30 or 5:00. I like to get there early and set everything up and wait for daylight, but there again I hunt large 15 to 30 feet high box stands.
If you don't understand the technology which you depend on, you will soon be a victim of that technology.