921 draws 18w though, pretty big diff from 5w. the other 906/912/9## series seem to vary from 5-18w, maybe a lower wattage one might work. I have a 7w (think its 7-8w) 906 bulb right now im gonna try when I get a chance, but I know that they don't fit in the blinking corner bulb, only teh parking bulb (which worked fine).