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This guide is for those who are planning to purchase or have purchased aftermarket auto lights already and explains what you can do to minimize the chance that your brand new lights might get water condensation or fogged up. Even if you purchase a set of lights from a dealer, they don't guarantee it free of condensation either.
For most of the auto lights, they come with one or several ventilation paths located in the back of the lights as shown below.
You might purchase a set of new lights to replace the stock ones, but re-use your old bulbs, which might have been used for a long time, and the rubber seals on the bulb sockets are either worn out or strangely shaped and might not function well on the new lights. Therefore, the following is what you need to do when using your original bulbs with the new lights.
Most aftermarket lights do not require brand new bulbs. Instead you can just use your stock ones. However, please make sure that you revive or change the rubber seal as show in the pic above. Reviving can be easily done by applying some Vaseline to it. By the way, do not touch the bulbs or leave any Vaseline on the bulbs as that would shorten their life.
If you have done these two simple steps, then you should be very happy with the look of these beautiful and well-priced aftermarket lights.
Some other things I would like to address are from whom you should buy aftermarket lights and how to determine if an eBay seller is a good one.
All these performance auto lights selling on eBay are actually only from three or four different manufacturers. In other words, if you prefer some style of lights, regardless from which seller you purchase them, you are getting the lights from the same manufacturer but different channels. Therefore, it is very crucial that you make purchases from a responsible, long-term, and honest seller.
Feedback scores: "The higher the score the better the service" is still the rule of thumb. Feedback scores also tell you the size of the seller. The higher the bigger because bigger sellers normally maintain their own inventory; hence, reduce the time you get your purchases. Additionally, you should still spend some time and scan through the feedbacks other buyers have left to the sellers even though the seller has higher feedback score. Scan through both positive and negative ones so you can get a feel on how the seller is doing. Some sellers would reply to feedbacks received so you know the whole story. Not just one-side whining. Normally from the feedbacks and replies, you can find out some crucial information in seller's policy or things you should know before bidding but you have no time to read through the terms and conditions of the auction.
Ask questions for whatever reason: If you don't get an answer within two business days, it's better you buy from somewhere else. Let's put it this way "If a seller cannot reply to your questions in a timely fashion, he or she will not help you when you really have problems associated with your purchase."
Make sure to buy from those sellers who have specified their warranty info in eBay's system, "Buy Safely" section. Not just in their ADs. Usually if they don't specify or list the warranty info in eBay's selling form, which is located on the right of the item price section and right below the "Meet the seller" section, warranty service is not guaranteed or they might run around when you need it. So is the item condition. You should see that in the place right beneath "Description" in the ad. Both sections are depicted below.