I have never felt using a light was or was not an issue, and have always used a headlamp when I needed to see to get in in the morning to my setup/roosted birds. I always figured the turkeys were asleep, and even if not, that I got there early enough that they would forget about me by the time they were getting ready to fly down. Now I read that all these guys that are smarter than me, for sure, seem to think using a light may be a concern. I have recently read about a green LED light that is supposed to be less " bothersome" to turkeys, and plan to acquire one before next spring. Their website address/link is:

http://www.streamlight.com

The item is a Green Trident LED headlamp, and it costs about $35.00.