Do you mean High-end GPUs? I don't know if it's profitable to mine with GPUs nowadays with 0.12kwh power maybe for ASICs.
I'm thinking twice for Bitcoin node but my plan is to install Bitcoin node for the lightning network. Do you think I can make few bucks for running a lightning node?
Yes its barely profitable with high-end GPUs to mine especially with 12c power which is considered average.
You can run a lightning network but right now most of the usage is experimental and doesn't really have much transactions. Most people are just testing it out for bugs and such. I don't think you will be able to make much by hosting a LN node.
If you really want to mine then just buy a second hand RX 470 8GB GPU for like $75 and just mine ETH, you will make a nickel a day. If ETH doubles you get a dime. But who knows, maybe one day it will hit $1400 again and it will be worth it.