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Regarding kelvins and colour temperature:
2200-2500k very warm white, colour of decorative light bulbs
2700k is considered warm white, the colour of incandescent lightbulbs
3000k, also a warm white, but slightly cooler, the colour of halogen
4000k, cool white
6500k, very cool white, often referred to as daylight
In fluorescent tube they had a coding (at least in the Netherlands) that did not only give the kelvins but also the quality of light: 827 is 2700k in quality 8, 840 is a good quality cool white, but 640 is a lower quality 4000k, with a bluish tint to it. You also have the daylight tubes, which are quality 9; 950, 960, etc, but because of the quality of light they give 30% less light than the quality 8 tubes.
In LEDs I've yet to come across one (we sell light sources in our store) that give the quality on the box, only the kelvins. Especially in the beginning the kelvins didn't mean much. It might be a bulb that was 2700k but it could have a blue, green, orange or purple hue to it. They've worked that out, luckily. But we still have bulbs that are all 2200k but different brands are different colours; one might be more orangy, another brand more yellowish.
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