What is the function of the image of "lamp" written by Huang Tingjian in the poem "Leaving JiNing Du Jian at Night"?

The boat is far away, and the lights at the foot of Jingyang Mountain are still ethereal. I am alone in a small boat, drifting with the tide on the river. Why is this scene so embarrassing? The image of "lamp" in the poem renders a strong sad atmosphere, imitating people with things, expressing feelings with scenery and turning people's troubles with scenic spots, which is quite meaningful.

Attached:

"Night hair wins Du Jian" (Huang Tingjian)

A bend in Yangguan flows eastward,

You can get on a brightly lit boat.

I'm only as drunk as ordinary people,

It's worrying to be full of romantic eyes.

This farewell poem blends many scenes. The first two sentences write various parting images, which deeply express the feelings of parting and render a strong sad atmosphere. The last two sentences are the same as usual, but they are full of romantic worries about themselves, which makes people even more sad.