Sidelights - W5WB? - Alfa Romeo Forum
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Sidelights - W5WB?

O/S front sidelight went. Not bad after more than 2 years ownership.

So I noticed that the manual says W5WB. No idea what B meant, picked up Bosch W5W in Halfords.

When I went to fit, I noticed the bulbs currently fitted have blue coating. The new Bosch ones look very orang compared to what was there before.

Were blue coated W5Ws standard for the 2006 159?
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get yourself some led ones from ebay. then hopefully you'll never need to bother fiddling about with sidelight replacement again.
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The blue coating are probably past replacements, the coating is designed to throw out a bluer/white light, than the normal yellow white, ala HID effect
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Original they are blue coated.
The B means blue

The orange coated ones are for the side indicators.
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sidelights , w5wb

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