Butter lamps in Jokhang Temple, photo from Xinhua on December 1.

Lamas of Jokhang Temple light up lamps on December 1 which marks the Tsongkapa Butter Lamp Festival, photo from Xinhua.

Believers gather on the square of Jokhang Temple, Lhasa on December 1 which marks the Tsongkapa Butter Lamp Festival, photo from Xinhua.

Lamas of Jokhang Temple in Lhasa are chanting sutra on December 1 which marks the Tsongkapa Butter Lamp Festival, photo from Xinhua.

A lama lights up a lamp in the Jokhang Temple in Lhasa, capital of southwest China's Tibet Autonomous Region on December 1, 2010, photo from Xinhua.

Tsongkapa Butter Lamp Festival on October 25 on Tibetan calendar marks the nirvana day of master Tsongkhapa, founder of the Gelug Sect of the Tibetan Buddhism. Tibetan pilgrims light up butter lamps and have Tibetan flour conjee meal at night to commemorate this great master.

Thousands of Tibetan pilgrims celebrate the festival on December 1 in Lhasa, capital city of Tibet Autonomous Region.