The lower the Kelvin, the warmer the light.  Color temperatutres above 5000 tend to make spaces look larger, cleaner, and  merchandise displays are apt pop out. 3000K one of the warmest colors. Good for accenting, but a poor choice for overall lighting. Can ehance some colors, but it's yellow/green peak gives a "smokers lounge" look to most spaces. Tends to give a cramped look to rooms. 3500K "Medium Warm", with similar drawbacks as the 3000K lamp, such as reducing the apparent size of a room.  Will cause clothing to shift color. 3700-3900K Natural: This clean pinkish light  was a mainstay for meat displays.   Excellent CRI of 90, low lumen output. 4100K Cool white: Inexpensive, mass produced lamp.  Very unflattering to people and objects. It's  green/yellow bias makes it  visual 'poison", to be avoided. 5000K "Full spectrum".  Close reproduction of summer noon sunlight, usually very good color rendering. Depending on the particular phosphor blend, this lamp can be a bright, crisp, super white. 5500-6500K "Full spectrum".  Most approximate noon sunlight though have trouble enriching reds. Many exhibit a strong greenish bias. 6500K Originally named Daylight, the phosphor has been updated. Renamed Daylight Deluxe. This blue-white lamp also exhibits a strong green bias. 6800K The Skylighter (HD)   Creates a skylight  effect from a standard fixture. Excellent to use in conjunction with daylighting architecture. Comfortable on the eyes and appears very natural.  High kelvin without the sacrifice of reds. 7500K C75 was the former standard in critical color matching. A CRI of of at least 90 with a distinct blue tone. C75 lamps are weak in rendering reds, and have a low light output.
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