How about
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Get Information About Your Indoor Gardening Lighting Needs!!
Kelvin and Watts Text - Physics Forums Library
What Lamp Type Should I Use? - Plantlighting Hydroponics & Grow Lights
Light spectrum ?? Can anyone help 
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I think you get the idea. For most orchid growers it's not an issue. But for Pot growers it tends to be. I also would worry about raddish and lettuce, as well. For orchids we want both. I think most of us have settled on 5000-6000K as the sought after target. It represents high noon at the equator, as for color temperature, and as such must be good, right?
No, the color spectrum as per plants is a demonstrtated fact. I tried to include some quick links, but wasn't able to lay my hands on the scientific stuff as quickly. It's not a folk-tale (to be sure.) It is true that warmer Kelvin promotes blossoms and cooler promotes leaf growth. If you need more proof I will be happy to research for you.
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Ross
http://orchids-ross.blogspot.com/
I don't do most Dendros or large, "floofy orchids". For me it's minis (like Angraecoides), Masdies, Paphs, and others that crept in somewhere along the line. See my orchid list for complete collection (usually not current.)