Dont think about only the life of the bulbs. Think about the effects as well...Mini D2S are max rated for 55w. There is a reason for it...if you go over that it will definitely burn/fade away the chrome reflector inside in the long run. OEM projectors in BMW,Audi and Mercs also burns in the long runs only at 35w
Plus OEM Bulbs last longer. I myself have Philips D2S 85122 in my car and its been more than 4 years. Running good as new.
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