No yellow beams are lethal, I have used yellow lenses/bulbs in old cars before trying stock halogen bulbs and again with retro fitted HID's/projectors, they're fine until there's fog/smoke/mist, then all you see is a white solid cloud infront of you, higher kelvin doesn't do this, that's why they don't use yellow.
Another scary thing is, things like deers/rabbits are harder to notice with yellow, I found they tend to blend into foresty/grassy/bank areas more under yellow light due to having a colour tint over everything you see, this in the rain makes things very dangerous, with white lights you obviously spot a grey/brown animal as there's no colour tinting everything you see.
High Kelvin does do that. It's a smaller wavelength so it doesn't penetrate as well. The closer you get to blue the more it scatters.
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