I assume you mean the "6500K" and the various "nm" measures. Those aren't a measure of brightness. The 6500K is a color temperature. The higher the number, the slightly bluer tint or "cooler" the light appears. 6500K would be considered "cool". In general, all 5mm white LED's are cool, though, so not a terribly informative number.

The "nm" numbers are the wavelengths of the individual colored units in nanometers. White is a mixture of colors so you can't list a single wavelength number for it. It is a more accurate description of the color. If a customer wants to know if the red model is a deep red or more of a red-orange, they can immediately tell from the wavelength.