Where are Zhuge Liang's seven life-prolonging lamps?

This is in the Romance of the Three Kingdoms (No.103). Gu Sima was trapped in the original Zhuge Guixing, and Zhuge Liang looked up at the astronomy and found that his general star was dark and knew that his life was at stake.

He said to Jiang Wei, "I am familiar with the method of blessing, but I don't know what is providence." Forty-nine soldiers can be led, each holding a soap flag, wearing soap clothes and walking around the account; I prayed for Beidou from my account. If the main light doesn't go out within seven days, my life can be increased by one year; If the light goes out, I will die. "

There are seven lights in the room. If the main light doesn't go out within seven days, you can live another year (twelve years). Unfortunately, Wei Yan rushed into the room to report the situation and put out the main light.

In August, Zhuge Liang died in Wuzhangyuan.

Whether it is true or not remains to be verified, because there is still controversy about Zhuge Liang's prototype characters.