A practical light bulb requires a filament that works well, is durable, and produces a high ratio of light output to heat, beyond the simple principle of heating something until it glows.

“use in the light bulb like the basic idea is very simple you make something hot and it glows but then like what actually what filament actually works well for that in a product what is like durable what like has the sort of highest ratio of like light out”

“the output versus like heats and like um so that you have less waste”