6000k is a temp you will rarely see used in homes and businesses, but rather primarily out in street lighting, and even then, thankfully, we are seeing many realize the error in their ways and cutting back to less bluish colors such as 4000k, and in the case of the local municipality here, going to 3000K in the residential areas which looks great with the right lumen selection. I myself have replaced a number of 5000 and 6000k parking lot fixtures due to the complaint of too much blue, or from complaints from residents nearby and also staff.  Same goes for inside the buildings, when initial Fluorescent to LED upgrades were made, they (the facilities managers and lighting contractors) went with 5000K "daylight" as it was used commonly thought that was going to be great for brightening things up, but resulted in complaints of eye strain and headaches from employees/owners and what not. Apparently even a few employees would wear some form of sunglasses it got to be so bad for them-  When I installed 3500K (and in some cases even 3000k) higher lumen LED to replace those 5000K in the office areas, the feedback was always good, and I would put a higher lumen 4000K in the warehouses and again, "much better!" "It doesn't hurt my eyes anymore" responses from employees and management.  The right color temp for the environment and the right lumens matter.   

As for the color selectable tubes/bulb-  My argument was for having the more commonly used colors more. such as 3000, 3500, and 4000.  You will see warm colors in homes, and rightfully so - most folks prefer a warm welcoming and relaxing colortone in their homes. 

We are now seeing more of these color select bulbs offering more options including the most important colors, 3000, 3500, 4000. (and perhaps 5000)  and a few now with 6500 included as technology has improved. Take the link from the place I get bulbs from as example.  Hopefully the big box stores will provide lamps with more selections soon, instead of just 4000, 5000, and 6500.  Some stores will have 3000, 4000, and 5000.  Some will have 3000, 3500, 4000, 5000.  But those are rare.  Hopefully getting to be more common.  Back in the days of the T12, 3500k was a color that was extremely rare and we never saw a lot of, but when T8s came out, the popularity of the 3500 really spiked and was favorable. Especially when the color correction 900 series came out.  I'd still be using those today if fluorescents were not banned in Colorado, forcing my clients to have to do an initial costly upgrade to LED (extra labor to eliminate the ballasts/ballast bypass as plug and play is not a good idea for most applications due to the ballast being a future failure point)

https://www.1000bulbs.com/product/224832/PLT-50305.html

Here 6000/6500K is the most common everywhere - Homes, businesses, etc. Seems that outdoor lighting is the biggest exception, there the most common is 4000

It does make sense that for people who generally prefer the 6000K-colors, to give them some fine tuning option around that spot, and not far off color options which they won't use. If you want 3000/4000K you'll just get the other tube with the other set of colors



Personally for me :

I use 6500K Halophosphor Fluorescents throughout my workshop and they are great, even when i am there for very extended periods

At the same time i think LEDs of any color temp are plain unfit for purpose (all of them by awful spectrum, >3000K additionally by amount of blue light, and <3000K by color temperature)



The extreme edges of available LED colors ("white" temperatures) - <2000K and >7000K are a bit of special cases :

6000K is a pretend white light. It is white enough in appearance to make us think it is normal light, while in reality it is anything but. Blue light aside, it lacks the central band of spectrum that we are the most sensitive to - Green. My understanding is that looking at things under the light, some things will appear off, and our vision intuitively will feel stuck, unable to figure out why nothing looks right, despite it being white and apparently all colors are there. This may not be too critical in some applications, but probably not good long term in most places

7000K is so far off the scale that the vision easily writes off everything it misunderstands to the lighting and isn't bothered with it. The only problem with it is then the blue light

2000K is "not white" enough that we don't put high expectations for color rendering with it either, and in 2000K the amount of blue light is low. This may actually be one LED color with no significant drawbacks, except it is not appropriate for a lot of places