I have built two of these bulbs as interior lighting (reading lights) in our Skoda Octavia 1U. After bending over one of the connecting wires (for polarity) went the installation without a hitch. The light is much brighter (though colder) than with the built-in 5W - light bulbs - and in Auti the bluish light fits very well. I highly recommend these bulbs - and I hope that the life is quite high.