I fitted +50s about 4 yrs ago in both the P38 and a VX Calais. Significant improvement over the then standard halogens. I don't like to do a lot of long distance night driving these days... but on long stretches where there's no oncoming traffic, they're quite effective.
From a safety point of view there's always the risk that when you dip the very bright high beams for oncoming traffic at highway speeds, you're effectively driving outside the range of low beam ...
MY99 RR P38 HSE 4.6 (Thor) gone (to Tasmania)
2020 Subaru Impreza S ('SWMBO's Express' )
2023 Ineos Grenadier Trialmaster (diesel)
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