The small ones come with 30W halogen bulbs (the large ones with 50W ones) which are a bit brighter than the standard 21W incandescant globes. The halogens also have reflectors which makes them brighter again. Put it this way - I have the large ones and when I turn them on to turn off the highway to my house at night it floods the huge sign on the exit with flashing yellow light.
However the visible angle (about 80 degrees) of the silver bullets is less than that of the standard lights (roughly 120 degrees) so the turn signals will be less visible from the side.
The LED inserts for them should be about as bright as the standard turn signals.
Matt
