I have two carriage lamps outside, one is integral and one has a bulb, it seems the integral one is far the better of the two, but it is really because the integral has the light at the top shinning down, and the bulb has the light at the bottom and shines up, use of a reflector has improved the bulb one.
But it seems although the LED bulb emits the light in a different direction, carriage lamp manufactories have not changed their design to suit.