They replaced Xtreme Power bulbs that are no longer available. Only one blew out so I put one in for comparison. Yes, they say switch two at a time, but that might be to sell more bulbs. Who knows, maybe I met the one that burned out during installation, which shortened its lifespan. But I digress. These bulbs are slightly brighter than the Xtremes. I wouldn't say 20% as Xtremes were listed at 80%. But these are great lamps and I hope they last a long time. Xtremes lasted 4 years. But they were not listed as 100%. If they burn harder, they will burn out sooner. Not as fast as SilverStar as they last about a year.
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