I've only had them for a week but so far I'm very impressed with these super thin light bars. They are a lot brighter than I expected considering their size and price. The specified luminous flux of 770 lm is perhaps a bit of an exaggeration, but not by much. The beam pattern is scattered, but mostly focused into a narrow line, maybe 20-30 degrees wide. The polycarbonate lens is interesting. Light appears to have a slight prism effect when viewed from different angles. It could be something like love/hate. I like it a lot, but note that the color of the light changes from very cold to slightly warm depending on the viewing angle. The construction is very solid! I can trust the IP68 rating but only time will tell. I can say that there is no need to apply additional silicone sealant to the seams because it has already been done for you! In addition, the housing is made of metal, aluminum is suspected. The bottom line is that this is a great deal and it seems like they should be worth 2-3x the current price of $23.99. Now I just have to wait and see how they deal with the sun. Nothing to regret! **UPDATE FEBRUARY 17, 2017** A few months after I installed two of them as DRLs in my truck, condensation formed in one of them and it no longer works. The replacement was easy and I sealed the polycarbonate lens seam with silicone sealant. No problems so far but had to deduct a star. I'm still very happy with the purchase as it seems to have a unique design and is very eye-catching for its size. No signs of condensation or discoloration. Very satisfied.
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