In this german review it says:
Despite the specified color temperature of 5000-5500 K, my sample achieved a CCT of over 6200 K in the test. Nevertheless, it lies almost perfectly on the black body curve, resulting in a pure white without color distortion. This LED is highly recommended for lighting tasks where color fidelity and the purest possible white are important.
Which at least in my configuration is absolutely true, very pure white. Not very efficient, but very beautiful.