Okay, that explains it. As long as it doesn't cause unexpected side-effects (as your reply would support), I can live with it. Is it good practice to name them all the same, though?

Thank you so much for clearing that up for me. Is this documented somewhere? I looked, but couldn't find anything.

For training purposes, I just created a simple mod that adds a new lamp recipe, item, and entity with modified energy requirements.

All added prototypes are exact deep copies of the original small-lamp. Everything works as expected, only:

My modded item, when crafted, shows an additional "Yield ...