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Comparison of the ballasts for the 35w hids and the 50w hids
ballasts
The 50w is on the right, it is supposed to be coated to keep the heat down. I hope the coating works, it is going to be mounted in plastic!
The advantage to getting the 50w version over the 35w is that you get this with it
what the?
OK, must make sense in China. 
That's all for now, the installation and comparison will have to come later.
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