Safely install electricity in the shower

I wouldn't take a spot as small as possible with a narrow beam angle, it only creates shadows and causes glare

He needs it for his mirror story. I don't even know what all the fuss is about. You can just put any lamp on the ceiling. Unless you have a steam shower with jets from below to above, nothing ever gets there... You also don't aim the beam there. There don't seem to be any children there (anymore)...

I am less worried about the safety of someone showering than - as mentioned above - about the regulations that I want to comply with as much as possible. The electrician who installed the system says that a "normal lamp" is not allowed in the spot above the shower. To avoid a reliable clarification of this question, the idea with the reflector would be a simple solution and I would personally find it funny, as long as it produces usable light. Just as I imagine it now, the spot itself is hardly visible. It will be installed in such a way that you definitely cannot look directly into it and it shines onto a matte reflector - a flat, spherical segment-shaped disc that becomes the actual light source. How the lights and shadows will actually look can only be assessed after it is installed. Whether I try it depends on whether I find a spotlight that "fits". Small, bright, focused, and with a replaceable LED.

This is dealt with by DIN 57100/VDE 100 Part 701. It distinguishes four areas:

Area 1 - Area above bathtub or shower tray
The area includes the surfaces above the bathtub or shower tray up to a height of 2.25 m above the floor. Within a radius of 60 cm around the showerhead or bathtub or shower tray, the luminaires must have at least the protection class IP X5 (protected against water jets).

Well, maybe it helps.

I have two spots in the shower with 230V. Since my electrician (from the general contractor) was useless, he simply ran a cable to the points to bypass the issue, and I then connected these myself to the light switch / connected the spots. The spots have IP44. The spots are at about 2.5m height and the terminals / cables are well hidden in the drywall ceiling. The spot itself is well sealed and shielded with a glass pane, the housing fits quite tightly. The only weak point I could identify is a tiny ring gap.
BUT I still plan to convert these two spots to low voltage with a transformer – better safe than sorry. You just never know if the kids get older and go showering whether they might come up with stupid ideas...
By the way, the beam angle is 120°, and I find that better than, for example, 30°. It gives a more pleasant light, especially the walls are lit higher up / the light reaches further up.

Sounds good :)

Are there photos?

Then you can imagine it even better

Keep your hands off it. Only 12 volts belongs in the shower, and that with an external power supply outside the hazardous area.

In the shower, you are perfectly grounded, the skin is softened and has low contact resistance. This alone already leads with high probability to a fatal current flow through the body at 230V. In the process you flinch, slip, fall over, hit your head somewhere, break something, etc.

Anyone who installs a 230V lamp in the shower also blows dry their hair in the bathtub.

PS: You should not rely 100% on the RCD either. Even if it prevents ventricular fibrillation, you can hit your head so badly in a fall in the shower that you do not get up again. Never again...