I don't know if all of the bulbs of this type do this or not. I just know that the particular ones I have do.
It seems that Your Mileage May Vary when it comes to aftermarket bulbs like this. I don't know if perhaps there's a higher quality bulb available somewhere, though I figured for the price these have to be damned good. They were expensive; a pair was $50! The quality on them seems quite excellent from a build perspective.
How would this be done?
If it involves splicing into wiring, I won't be doing this...