No, I haven't used the blue lights. If your lenses a badly yellowed, no bulb will give you the light you need. I polished the lenses on an '86 240 with pretty good results. If you try a search on polishing lenses in this site, you'll get lots of advice on how to do it. The other option is to replace just the lenses with new ones. If you have the lenses off, NEVER touch the silvered reflector!!! Don't ask me how I learned this.