Half-slabs or stairs or any other transparent block or is flagged non-spawnable (Aluminum blocks or xycraft blocks / bricks if you have it). Or light. Endermen still follow regular hostile mob spawning rules in that regard. Using forcefields and/or security stations only I'd say get more power generation as my only suggestion. Lol.
BSEUNHIR - Thank you!!
Unfortunately the second part of my post applies even more. What I pictured and what I have are far from the same. I've linked the security station to my projector and placed it right outside the FF. I was expecting to click or right-click on the station with the card and see the FF go down or something. Yeah I was pretty far off... Did I miss something in the 40 middle pages of this thread on the mechanics here?
No one has to answer - I already feel dumb cuz it looks like no one else is asking these questions... Is this the wrong thread for this?
If your problem is endermen filling up all your hostile mob spaces, just build the machine really far away from the main island. you could make a lighted/xycraft brick path their or use ic2's teleporters to get their. 200 blocks is enough to prevent existing endermen from using up your mob slots as long as you don't get any spawning on the path their.