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Cree makes LED chips, not bulbs, so you can find dozens of bulb brands that use Cree chips. Philips makes both chips and bulbs, so you can buy Philips chips in Philips bulbs, or in many other brands of bulbs.
As for LED coding, as best I can tell that has nothing to do with the voltage. Halogens are sent a pulse modulated voltage, similar to AC in that it's not a constant voltage but one that swings from zero to 12v (13.8v actually) fast enough that the bulb filament doesn't cool enough between pulses for the light level to flicker. They do this because it lowers the power draw on the electrical system, allowing for a smaller alternator, which increases fuel mileage. I guess every little bit helps. You can't use pulse wave modulated voltage with LED because they don't use filaments that heat and they will flicker. The same applies with the hot and cold checks. They send a set of fast voltage pulses to the lamps that are too short to heat up filaments to the point that the bulbs light up. LEDs respond to applied voltage some five times faster than incandescent, so the hot and cold checks do cause LEDs to blink every four seconds.
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