The baking is just to soften the glue to be able to remove the headlight lense. Then you can paint the chrome housing inside. I did it cuz the chrome lights looked funny on my black truck. It was stricktly a cosmetic thing. As for light output, our trucks use projectors and do not use the housings to project the light. Therefor painting the housings does not change the light output. Removing the turn signal lense does reduce the turn signal output, but I bought REALLY bright LED bulbs and they can be seen just fine. Hope that answers your question.