After weeding out any LED Bulbs and trying the newer decorative incandescent ones, which were unpleasant, I ended up ordering halogen bulbs from Amazon.
They come with a 2700k warm white spectrum and you can get them with 40, 150 or 250w, the latter ones probably being special products for ambiental photography lighting.
Anyways. Since they emit a pleasant warm white colour and are 100% flicker-free, I can enjoy my evenings again, without starting to suffer from flickering/PWM related headaches.