Are there also black lamps?

Answer

Hi Aster,

What you say to your question is immediately the answer; black is the absence of visible rays (light).

However, a note:
– There are also ‘blacklight’ lamps. These are lamps that emit mostly invisible UV light, and some visible violet light.
That UV light can be converted into visible light by certain substances that then light up more brightly.
Blacklights are used, for example, at parties and performances where some clothing becomes extra bright. These lamps are also sometimes used to check whether money notes are genuine or counterfeit.

Greetings,
Luc.