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I'm going to a H4 LED headlight bulb this year. I checked out your link Wade, which in turn led me to this ebay listing. These are 30 x 2 watts and 3800 lm x 2 vs. 25 x 2 watts and 1800 lm x 2. In my link it doesn't break it down by hi/low beam, just says "up to x number of lm". Nevertheless there seems to be a huge discrepancy between the two. I must be missing something here or...?


What does 'lm' signify, Lumens?