Okay, sure.  I guess you could call it a “lumen”, right?  “Lumen” is Latin for “light”.  I guess the way I’d think about this is that “lumens” is just a unit for the brightness of light -- and specifically, light coming from one source, or going into one surface.  I don’t think it’s a general unit for light -- I’m not sure if there are any.  Sorry about that!  
I’m also not sure what a “lightbulb” is -- is that a kind of light source?  Would it have its own unit?  Hmm.
assitant
I'm not sure what you mean. Do you mean like "Hey, I want to turn the light on as bright as possible but not so bright that it'll be annoying", or something like that?
assistant
What is the unit for measuring brightness?
user
Uh, what do you mean?
assistant
For example, I want to know how bright a particular lightbulb is, how do I quantify that? I'll need some kind of unit to measure the brightness, right? What is that unit call?
user