Look at a light bulb when the filament is heated and is emitting light. Then look at it when it is not. The only people who can’t see the difference are blind, literally.
When the filament is cold, you can see it because of light that comes from it after having been reflected off of it, rather than having been emitted from it originally; or, if it's dark on a light background, because of light that comes from other parts of the lightbulb after being transmitted through it from behind. In all of these cases, what you see in the photo is light that came from the lightbulb, and all of them are equally legitimately "pictures of the lightbulb", although they might display more or less detail.
You're looking for the word "glow". People are (somewhat rightfully) piling up on you because all pictures indeed are pictures of light, whether that light is reflected by an inactive lightbulb or is from its powered, glowing filament.