Lukhang (Tib. klu khang, residence of Nagas), formally Zongdag Lukhang (Tib. rdzong bdag klu khang [?], residence of Nagas, lords of the castle and administered territory [?]) is the name of a secret temple of His Holiness Lozang Gyatso, 5th Dalai Lama. Three walls of the temple are covered with murals of yogis engaged in their exercises.
The temple is situated on a small island on a lake behind the Potala palace in Lhasa.
The Crystal and The Way of Light. Sutra, Tantra and Dzogchen by Chögyal Namkhai Norbu. Compiled and Edited by John Shane, Snow Lion Publications, Ithaca, NY, USA, 2000, ISBN 1-55939-135-9, pp. 82-87, 190, 191.