Not sure I can claim they're energy efficient since the two i installed take more power than the original but i guess on a lumens per watt scale they are? SUPER bright. Love it. The actual electrical connectors suck the big one. The do NOT like to clamp on. Once they eventually do, they're great. It's going to take some playing with them, and hopefully you won't blow your fuse. :) I did about 4 times. May the force be with you
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