I'm actually considering splurging and going with V-LEDs new V3 Triton Bulb for switchbacks.
It's $100 a pair (only preorder, will go up to $140 after first orders are shipped at end of month) but it comes with a lifetime warranty and it's universal so I could transfer it over to a different car if I want to in the future.
600 lumens white and 430 lumens amber which is pretty impressive.
Only problem is they don't offer a 5k version! only 6k. I think I might just go with a 6k setup because a lifetime warranty when it comes to LEDs is very valuable I think.