..
I have obtained an RMA from Zebralight and will post the light to them today. I will report back in this thread in a week or two when they offer me a replacement.
OK,.. I said I would report back/... Zebralight replaced my Yellow Do-nut with a very nice emitter sample that they found in the "binning" Five Gold Stars to Zebralight ! They are a responsible and reliable company that stands behind their product.. I can recommend purchases from them without hesitation. They made good on a bad sample that crept into the supply chain.
Let discuss a little about how this sample wound up in the production Zebra MKIII that I was shipped. The question "How can this happen?" is a valid one.
I am going to dodge that question here by just giving you a reading list that explains it all. (homework my teachers used to call it.. :thinking
What if I told you the Yellow Dot is in some samples of MKIII CW because:
"No LED manufacturer can produce uniform color points in their white LEDs; rather, they produce batches of LEDs with varying distributions of color and flux to create inventory based on the results of the production."
If you think I just made that sentence up, then think again. It is Crees own words from the following: Cree Document : LED Color Mixing: Basics and Background: CREE Document:CLD-AP38 REV 1
So Here's the reading List:
1.) Essential reading and you can find it (the PDF)
HERE or
HERE
2.) Other Essential reading on all this is:
This is an extremely important discussion of white light LEDs and the prediction of color rendering rank of a set of sample light sources. This is essential reading if you are one of those people here on CPF that throws around phrases like "High CRI".. You may be amazed about what is really happening with human perception of color fidelity. Be sure to read the very last paragraph on page 2 that gives recommendations that you might want to take to heart.
and, of course:
3.) Essential Reading:
http://www.cree.com/LED-Components-and-Modules/Document-Library
...the Specific Fact Sheets and Product Pages for many Cree Lamps you find in your lights.