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Old 01-12-2013, 01:15 PM   #1
Anorak OP
Woolf Barnato
 
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Joined: Jul 2004
Location: OAK
Oddometer: 32,440
HIR headlight bulbs.

HIR stands for Halogen Infrared Reflecting. The inside of the bulb has a coating that reflects the infrared energy back at the filament which causes the filament to run hotter and thus brighter without greater energy consumption or apparently shorter lifespan. There are only two applications available, 9011 and 9012 which can be modified to fit 9005 and 9006. I found out about these bulbs because the Chevrolet Volt uses them. I wondered why the Volt doesn't use H.I.D. lights. The HIR2/9012 in the Volt is supposed to work almost as well as an H.I.D. without the complexity and expense of an H.I.D.
Here is an explanation
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