Got me a wood thief!

Could you just make the security light motion activated? So it will not bother them but will light the stacks if you need it or if anyone else is sneaking around out there?

They make some pretty convincing fake video cameras. Maybe if you put up a couple well-placed signs, that nobody would even see unless they were where they were not supposed to be, "no tresspassing" or "I use this wood to heat my house - if you steal it it's the same as me siphoning fuel from your tank" and maybe "this area under security watch" with the imitation cameras in a couple spots it would spook them off.
Has anyone tried a sign? Did it work?

motion sensing moving fake cam, $5 on amazon, probably junk tho...
http://www.amazon.com/SE-Fake-Surveillance-Camera-Sensor/dp/B000KDVT70