Nilavilakku

The traditional lamps which is lit during every auspicious occasions; in temples before the worship starts; at the official and unofficial functions.

Vilakku/dīpam (lamp) is one of five accessories of religious worship in Hinduism, Jainism and Buddhism; others being puṣpa (flowers), dhūpa (incense), gandhā (sandalwood paste) and nivedya (food).

Worshipping deities with these five accessories is generally considered as a way for achieving the four ends of human life; dharma, artha, kama and moksha.

As the sun sets, young girls of the family bring the lighted lamps to the verandah of the house, continued with evening prayers.

[3] A special type of Nilavilakku, called Aal Vilakku is used in Temples of South India, especially in Kerala.

Nilavilakku lamp from Kerala.
Seal of Chola Dynasty with two lamps, fish and tiger, 10th century.
Lamp depicted on relief, 300–200 BCE.
Nilavilakku