They only make sense for people with a clear lens. I put one in my bumper lens like that and it sucked bad. My bumper lens are amber but I wanted to try to match the silver star turns. I thought this would increase the amber, but it didn't. I put in a LED instead for my bumpers thats amber with 4 Little LED's in a square. When you put them in you have to turn it so they create a diamond...thats pretty cool looking at night when about10 feet away or closer.
Try em out if you like, I always look for ways to increase the amber.
Thats a cool Little deal they have tho on the site..go to categories and look at the bulbs, they show a M3 with them and some cool cursor type showcase effect thing.... WOW!