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"All of the other companies use GaN (Gallium Nitride). For awhile the GaN people were ahead of CREE in terms of brightness. I think that CREE has caught up in terms of brightness now and has a product that is cheaper..."

According to Cree's WebPages
Cree's super bright blue LEDs are using InGaN on a SiC substrate. This seems to be what HP is doing as well, based on the links you gave and the press release from October, witch names a SiC Blue LED.
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