I gave up caring about glare for oncoming motorists when I observed the same thing that
@TerryA observed. Here in the SF Bay area, where it seems like every 3rd car is a Tesla, I get blinded constantly because Teslas have the absolute worst headlight design out there in terms of blinding oncoming drivers. Therefore, I no longer care - mutually assured destruction. I use
these 4300K LEDs now in my 500E and am quite satisfied. Note - 68W on low beam and 69W on high at 13 volts.
Note that I never get anyone flashing at me for glare, but I am convinced that this is because everyone around here is already used to being blinded by Teslas so everyone has equally given up.