All right, there seems to be some discussion as to whether these are "official" or not. These K2 Stars are not manufactured by LumiLEDs the manufacturer of the K2. LumiLEDs has no plans of introducing a star package. One of the major advantages of the K2 over the Luxeon I, III, or V is that it can be used in reflow soldering applications. This makes it much easier to mass-produce products with the K2.
The K2 Stars have the exact same footprint as a Luxeon I, III or V Star, and are electrically isolated. You can now easily attach multiple K2 stars to the same heat sink and not worry about using an electrically isolating compound.
The Low Current K2, LXK2-PW12, is designed to operate at 350-700mA, while the High Current K2, LXK2-PW14, is designed to operate at higher currents, 1-1.5A.
We do not have the full binning on our website as it confuses the majority of people. This information is available upon request. We currently are out of stock of the 05027-PW14, however we do have some 05027-PW12s in stock.
K2 Stars
As of right now some of the low current K2 Stars that we have are of unknown bin. However we have a good number of RXOKs that are available. Let us know if there are any further questions about the K2 Stars.