What's All The Fuss?
Various companies and individuals are selling halogen headlamp bulbs with blue or purplish-blue glass. There are lots of spurious claims made for these bulbs. They're falsely advertised as "Xenon bulbs" or "HID bulbs", the blue glass is claimed to "force the bulb to perform at a higher level", and there are seemingly endless amounts of pseudoscience aimed at enticing buyers who want better performance from their headlamps. In fact, these bulbs reduce headlamp performance while increasing dangerous glare.
Just for read... apologize in advance if reposting...
For full story click here.. http://www.danielsternlighting.com/tech/bulbs/blue/bad/bad.html