I don't know about the 18 w Malibu's as I replaced my lights with PIAA halogen fog lights & think the Hella micro de would have been an even better choice.
I DO know about the 4 w Malibu's, because I bought some last night at the local Fleet/Farm & installed them in the clearance(horn) lights on top of the headlights...I couldn't believe the difference in brightness.
Before, I had some blue tinted c-194's in there that were OK, but the Malibu's are at least three times brighter.
Best purchace under three bucks I've made in a while.