There are accessory bulbs that contain Xenon. I think Philips makes one but forgot the bulb type. There are some aftermarket companies such, as Raybrig/Stanley that put Xenon gas in miniature bulbs also. They cost about 3x the price but, it is kind of old news. Osram/Sylvania also makes some that supposedly contain either Krypton and/or Xenon and I use those for brake lights. If you want to learn more or find out if you want Xenon reading bulbs. Go to the Philips Automotive Lighting Forum. All they talk about is automotive lighting.