The function of lighting oil lamps in the Hall of the Jade Emperor Daxiong

These are sacrifices. I'll popularize the knowledge of ten branches for you:

Generally speaking, there are many kinds of Buddhist offerings, such as the offerings of the Dharma Association, the offerings of accounting, the offerings of visualization, the offerings of the three professions, and the offerings of thousands of monks. However, we laity only know how to support Buddha with money. The most popular thing is offering ten things to Buddha, namely, incense, flowers, lamps, water, fruit, tea, food, treasure, pearls and clothes. There are certain metaphors, such as incense symbolizing abstinence, beautiful flowers, bright lamps, pure water, the fruit of Buddha's fruit, and tea symbolizing sobriety and food. Therefore, the Buddha does not need any support from the Buddha, but if you offer ten supports and reverence to any Buddha, they will gladly accept it. But if you support it, there will be blessings. Amitabha!

As for the jade emperor, he is also the supreme leader of heaven. He is still one step away from becoming a Buddha, so he can't escape from the six divisions in the wheel of karma. So he especially likes the things offered to the Buddha.