So I recently posted about some problems I was having with my LEDs. I fixed the problem by replacing bulbs (using solder). Everything has been fine ever since (its been a few weeks). However, yesterday I noticed that two bulbs are out (on two different strings). Here is a basic description: 48 3W Cree xp series LEDs Two 14"L x 6"W heatsinks - Each have 8 XP-E royal blue, XP-E 8 blue XP-G 4 neutral white, and 4 XP-G cool white LEDs. 80* optics on all. Runs off 4 dimmable meanwell drivers (12 bulbs/driver) (ELN-60-48P) RapidLED daylight controller for dimming control and sunrise/sunset control Here is the original build thread: http://www.3reef.com/forums/i-made/my-rapidled-build-fts-color-blended-pg6-121438.html Now my first question is: why do bulbs keep burning out? I did not build this setup myself, I bought it pre-built from atticus818. I was under the impression that LED bulbs were supposed to last 5-10 years.. The system itself is just over a year old, and 4 bulbs (out of 48 ) have burnt out now. Again, these bulbs are not all on the same string. I am also curious to know why the rest of the string isn't out... These bulbs are wired in series, so shouldn't the rest of the string go out? Like xmas lights? I really don't want to take this canopy off again and take everything apart... ugh. I am pretty sure I read that I can leave it "as is" without doing any harm if the bulbs are wired in series.