Installing new headlights

question

I have a question...I bought some after market headlights about six months ago and two of the lights had condensation inside the light...is that normal or what...I tried the clear silicon right after the lights did it for the first time; however, the driver side headlight would never comepletely clear up, but the others did...I sent the lights back and told them to send me some new ones...Has anyone had any problems with their lights once they have siliconed their lights?????
 
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