Ring light is a very popular choice for work in tattoo and piercing shops. It gives soft light if used with diffusers cover large enough area and also is good for taking pictures of work that has been done. And for people who like to make videos and time-lapses it also come with attachment for your smartphone or small camera.
Here is our affiliated link to Amazon.de for light itself and few useful accessories:
Neewer 18 inch Ring Light on amazon.de: https://amzn.to/3BRAgg1
Wall mount arm: https://amzn.to/3n6TrMO
Sandbags for safety: https://amzn.to/3B2f45W