Also note, most UV LEDs are around 3-4V Vf. I think you're thinking of IR LEDs with that wavelength? UV would be sub 400nm.
This makes sense, because the Vf is basically the band gap the electrons have to drop in the semiconductor material. As the wavelength goes up the required band gap increases (obviously there are some other second-order effects going on that don't make it completely linear, and varying Vf does not significantly change the wavelength... but it's still worth noting.)
And it doesn't make a whole lot of sense to specify a wavelength for white LEDs? Not only are white LEDs one of the most widely defined types (warm, cool, neutral, etc.) the wavelength is most certainly not one value. It's a wide spectrum, with two emission points...
Other than that, the posters look excellent!