Do plants REALLY care whether or not they are being lit by a 10,000k or a 6,700k bulb?

I tried asking my plants, but my wife threatened to call the men in white jackets again if I didn't stop.

No, the PAR can be the same (equal amount of photosynthetic active radiation). The PUR-efficiency (photosynthetic usable radiation) tends to be higher for 10K bulbs though, which doesn't really matter that much because you can always add another bulb/reflector if you don't mind the electricity bill.

This article I think explains very good what to look for in a bulb:
http://www.aquabotanic.com/lightcompare.htm
My own extended PUR-efficiency list:
http://www.defblog.se/permalink/1402.html

I suffered a couple of debilitating concussions this year that make it next to impossible to understand technical documents.

Those links look very informative, but I currently lack the ability to comprehend them.

Could someone simplify it for me a bit?

The difference between 6700k and 10000k is more important to you than to your plants.

The plants like both just fine. The better color temperature is the one your eyes like best.

What he said.......... K is only important to YOUR eyes.

Thank you!