A 4000K LED bulb produces a bright white or cool toned kind of color which gives a warm effect as well as bright enough to work.
4000k vs 5000k led. 4000K looks more pure and transparent than 2700K or 3000K. A 5000K LED bulb produces a bright daylight kind of color. So its good for bathrooms basements area and your study room.
Hero Series LED High Bay Lights are easy to install they come with a standard US Hook safety wire 5ft cord and. Both 5000K and 4000K can be used in various wattages. In fact red has the lowest color temperature then gradually increases in orange yellow white and blue blue is the highest color temperature.
A mid-way 3500-4000K start-to-finish is a good balance of the two. A 5000K LED bulb produces a bright daylight kind of color. The light produced from a 5000K LED bulb is a bright daylight-type color.
From what I can see from the Cree CXB datasheets or any COB datasheet the 5000k is by far the highest lumen output while the 3500k is much lower and the 4000k just a bit higher. A 4000K LED bulb produces a bright white or cool toned kind of color which gives a warm effect as well as bright enough to work beneath it. 3500k vs 4000k vs 5000k.
I recommend for indoor is to put 4000K in-active areas and 3000K in relaxed areas. Compared to my other 4000k Emitters its the most neutral looking tint xp-l hi 5D sst-20 219c. When you start to compare the differences in 3000K vs 4000K or 4000K vs 5000K it starts to get into the personal preference range.
During mid-day hours direct sunlight will have a color temperature over 5000K and daylight including the entire blue sky will have a color temperature closer to 6500K. Furthermore which is brighter 4000k or 6000k. Both 3000K and 4000K are still on the warmer side of the Kelvin scale as LED light fixtures can still reach 4800K 5000K and up to 6500K color temperatures.

