I wonder how fastly the lamp will warm up if you paint it with Vantablack, the bkackest paint in the world.

Vantablack is made out of carbon nanoutubes, so I think everythink will burn on fire like. 

Pretty much the same as if you paint it with ordinary Black paint (assuming no problems like the paint melting off etc)

Why :

The Blackest paint is intended to reduce reflection of light from the surface, in places where this is critical. Let's say (for example - i havent checked the numbers) that the "blackest" paint is 99.9% Black vs. "ordinary" paint is only 99% Black. In such application, you actually are interested in the remaining part. This means that with the "blackest" paint 0.1% of the light is reflected vs. with "ordinary" paint 1% is. This is 10X difference, so very significant

In an application where you need the absorbed light as heat, you are looking at the main part. The difference between 99.9% and 99% is 1.009X. It's very small difference

In this case its even more of a moot point : The light that got reflected will hit the paint again, so it will all get absorbed anyway

Darksucker paint..! 

Darksucker paint..! 

I had a feeling this would me mentioned. 

How the spectrum of a black painted halogen bulb shoud look?

How the spectrum of a black painted halogen bulb shoud look?

Orange incandescent. Assuming no material would fail at that temperature...
In real life the lam will just blow up...

If you are legitimately looking to make a homemade coloured bulb , consider getting some LED filament lamps and spray-painting them. I did that and it actually turned out very good and I use it in my bedside lamp. The lamp doesn't get hot so it does not harm the paint and it doesn't even look like an LED lamp.

If you try it you may need to practice a few times on some dead lamps to get it right before doing good lamps.

LED Spray-painted bulb

Nice idea, Lightingguy1994! Well, LED filaments are not as cheap as halogen bulbs but glass temperature and water resistant paint is not easy to get, while you can get a pray paint in your local chinese store.

I have a red paint, I only need the filament bulb now. 

I wonder what would happen if I paint a CFL over. 

I wonder what would happen if I paint a CFL over. 

Well that what most cheap colored cfls did instead of using colored phosphors.  

Well that what most cheap colored cfls did instead of using colored phosphors.  

So nothing bad should happen.

I've never seen a painted over CFL from factory, I think that its performance is really bad, but way cheaper than spetial color phosphores. 

So you can have one single CFL production line, then you can use paint to make warm, cold and colored CFLs. 

They are not "special color", they are just each ingredient of the 3 that make "triphosphor" phosphor mixes alone...