yes the 4K bulb is nice, and better than the harsher 5K+ was previoulsy using in kitchen, had been using a more expensive cree bulbs,
only available in 2.7k & 5K+ for reliability vs other bulbs that had failed.
It does not matter as much if the newer £2-3 bulbs are less reliable, indeed not very clear if there are any compromises with latest generation -
is the prices just economy of scale and reduced manufacturing cost ?
Thought
this US article was interesting -
a. dimmable bulbs typically going yellower at lower output
b. Installing higher cri bulbs in dining areas so you can see food in correct colour.
The higher cri 90+ hyperikon brand seem good (amazon replacing the ones I had with fm interference), but have not got a screwfix bulb cri 80 to compare them with, I would like to know if the higher cri genuinely have red leds in them and less (sleep disturbing) UV/blue frequencies.