I find this very odd. Decent lighting is so cheap that even minute increases in efficiency would be worth it. You'd expect all of those warehouses to be bathed in crisp blueish white light to keep people alert and avoid costly mistakes. Maybe amazon isn't as efficient as they're cracked up to be.
Bright blueish light is also what I'd expect for that kind of thing, since it's such a simple way to keep people more alert when they're physically tired.
