From wikipedia (Electric light): " In technical usage, a replaceable component that produces light from electricity is called a lamp."
EDIT: Yes, later in the same page: "Lamps are commonly called light bulbs;"
I think that the goal of the project is not "Doom running on a 40-Cortex M4" (actually an 80 M33...), which is pretty easy I guess, but "Doom running with only 108 kB of RAM", while keeping all the features (which is pretty hard, I guess). I recall that I had to bend over backwards to get it running on my 386 with only 4MB RAM.