Compared to other LED bulbs, they have a lower brightness (NOT much lower to be honest). Good, this type of bulbs has a more uniform brightness, the classic LEDs are not visible from the ceiling light, this is due to the external coating of the bulbs. Good, the heat sink placed in the back. At the time of assembly and after several starts of the car's dashboard, there is NO ERROR reporting problem. Bulbs mounted on the rear ceiling lights (right and left side) of a Lancia Delta 3 series.