This H7 bulbs are actually durable and sufficiently bright completely! Once at our Sorento every few months the candles of headlights blew, I tested several brand products provider and had incorporated an additional "surge protection", I fortunately discovered it here. Since then (1.5 years) no more and no luminance loss problems as here partially described (some people should from time to clean the headlights possibly .....) So from me a very strong buy recommendation! Who wants to have bright Xenon light, it must stop installing leave (I drive a car even with Xenon light and know the real difference) - but please do not start with the senseless candles because of + 90%, etc., that is a waste money!