C41 Something that emits green light

After looking at the drawing for a while, the boss nodded his head and said, "There is a master who is very good at making these things, but he has been living in seclusion for many years, I wonder if he's still willing to do it. This old man will give you the address, why don't you ask him yourself?"

"Alright, alright, alright. Thank you, boss