The title covers 95% of my problem...4000k is very difficult to find for some odd reason. I don't get it, personally. I think 5000k looks blue and 2700k-3000k looks yellow, and those temperatures dominate probably 99.9% of the market. There are some cheap Chinese LED lights on Amazon offering 4000k, but the reviews are horrendous - multiple DOA bulbs, flickering, extremely short life, poor color consistency, etc.
I previously have always used Hyperikon LED 4000k bulbs, and with the exception of the occasional QC issues with color they were/are great bulbs. Unfortunately it appears Hyperikon went out of business during COVID, so now I do not know where to buy bulbs anymore.
I've considered buying adjustable bulbs like Philips Hue, but I'm going to be using Lutron Casetta dimmers so there's a conflict with the bulb management and [from what I've read] there are also communication issues when using "smart" bulbs on a dimmer switch that varies voltage output. The hard switching at the wall is non-negotiable for me. I'm not going to rely on an app or gimmicky attachments for regular control of my lights. Occasional color changing? Sure. But normal operation? No way.
So with that said, can anyone recommend a good brand of CRI 90+ dimmable LED bulb that comes in 4000k and can operate on a regular LED wall box dimmer switch? I'll be mostly buying BR30 and A19, but I may get some BR20 and some more specialized bulbs like chandelier candlelight and outdoor floods if available. Just bought a new house, so I need to buy a lot of bulbs! I also prefer 75W or 100W equivalent bulbs, but I would settle for regular 65W equivalent bulbs if I have no other choice.