Yes the halogen first.
The camera then receive a little more light for the halogen picture..
So there may be more then 2 times more light between the led / Halogen.
The camera use 1/2,8 aperture for both bulbs; just change the speed.
@RedDevill. Yes I had a problem in my prius because the led-heater have a to big diameter over 51mm.
There where 2 solutions: reduce the diameter or insert a tube. I used the second solution. Easier.
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