I do not really now what you are asking for.....
But:
For "Can someone give me a "very" simple answer as to which K ( 3000K, 4100K, 5000K, 5500K, 6500K with CRI's all within 82 to 86) would
work best for vegetative growing part" there is no answer! The color temperature and the CRI does not influence growth and flowering in that way! Read this thread for more information:
Light for vegetative growth vs flowering? , there is way more parameters that come in for growth and flowering.....
Your statement:
"A light with a CRI rating of 93 is to bright for most of my orchids and from what i have read, for most orchids."
Were have you read this????
The CRI is the color rendering index, it has NOTHING with brightness to do! It is a value that describe how correct you see colors under the light! High value (max 100) give good colors, low value give a distinct color cast. Read :
Color rendering index - Wikipedia, the free encyclopedia
To conclude and for some directions.
Aim for high CRI value, this give you true color without color cast from your light.
For color temperature, a pure blue sky has roughly 10000K a normal day with some clouds have something like 5000-7000 K. If you aim for something between 5000-6500 it will be good for your plants!
If you have more direct questions ask them and we will help!
/Magnus