I agree. The distribution is the key. I found out the hard way.
The incandescent bulbs illuminate well and the light is nice and warm. They look good with the opaque windows. I thought the LED bulbs would be an easy and smart alternative, but I was wrong. The LED bulbs did not disperse the light like the incandescent bulbs, even at full power. They barely looked lit even in a darker room. I took the LED bulbs out and put the incandescent bulbs back in the cars. If I cannot find a better LED bulb that disperses the light like the incandescent bulbs, I will use the LED bulbs for lighting scenery and keep the incandescent bulbs in the cars.