The situation is different in the holder.
This made after unpacking a very, very cheap impression, which has unfortunately been confirmed later during assembly.
The fix at the desk was not the problem, but after I put the lamp in the place provided, was this rumwackeln so much on that I thought I had done something wrong.
So lamp again pulled out and looked at more closely.
The pin on the lamp, which is guided into the holder has a notch and it looks as if he could be locked by a rotary movement in the holder so that the lamp will not come out accidentally.
But since nothing is to lock! That would not be bad if the lamp would not wobble like a lamb's tail in the holder.
The holder of the black lamp does not look the same as in the photo of the selfsame lamp, but as with the white.
A wall mounting the bracket is also possible, as 4 holes are present. Then, the distance between the transformer and wall is so low, not to say that he even considered grinds past that I assume that the holder is simply not made for this lamp.
Conclusion: Well, difficult ...
For my use, it would be fine, because I would probably not be adjusted much.
Since my son but constantly changing the height and angle, let's hope that the support will survive a little longer and not fall apart after a month.