I have climbed Lug from both the Glen of Imaal side on the West and from the Glenmalure side on the East. If you are only planning on climbing Lug once, I would recommend doing it from the Glenmalure side.

Parking at the end of the Glenmaleur valley at T06644 94204 A, this route follows Fraughen Rock Glen, up the North Prison to the summit. Making a bit of a looped walk of this, we descended the spur going along by the South Prison to Clohernagh. Thinking it too steep, we went down the East spur of Cloghernagh which meant a horrible trek through some heather and gorse for about a kilometer. It was only as we got near the splendid Arts Lough we could see looking up a more direct route down at T06008 92381 B, rather than going down the spur. After Arts Lough, a short steep descent will bring you back to the road at Fraugheen Rock Glen. Simply follow this back to the car park. A well earned pint at Glenmalure Lodge awaits. Linkback: https://mountainviews.ie/summit/13/comment/20163/