The trail to Luna Peak starts off the same way as the trail to Pyrite Lake. At the Y junction, take the right branch (White Lines), which follows a band of white rock to the ridge, and then up the ridge to a rocky outcrop.
The last 150m to the summit of Luna Peak (2,700m) consists of a scramble. Luna Peak offers a 360-degree panorama, looking down on the lodge, the La Clyttle Glacier and across at the Mons and Lyell Glaciers.
This is also the approach to the Lyell Hut. Despite being such a high peak surrounded by rugged glaciers, this hike is non-technical but can feel somewhat exposed in places.