4000k? Not sure I would want to use those in my house.
“Color temperatures higher than 3500K are typically used for commercial and hospital applications, as the light is bright and has a bluish daylight cast that can be harsh for home interiors; but task lighting may be useful at 4000K and above. When selecting new lighting for your home, be sure to take its color temperature into account to ensure you’re making the right choice.”
It’s a personal preference. Some folks prefer the cooler (higher) temperature because it’s closer to natural daylight. Some folks prefer the warmer (lower) temperature because it’s closer to the incandescent bulbs they’ve been used to.