Shock Resistant Bulbs

[Rio Wil]

I just replaced a turn signal bulb on my 2001 IS with a bulb from an auto parts store.  The bulb is a long life bulb, but in comparing the two, the OEM Stanley bulb has a support wire that stabilizes the center of the low wattage filament (the one always burning).  I have noticed that auto part store headlight bulbs don't last as long as the OEM bulbs and am now wondering if the OEM headlight bulbs have a similar support wire that contributes to a longer life.   So, is there a "motorcycle" version of lamps because of the increased vibration on a bike..... Anyone have a OEM headlight bulb to inspect?

[wild6]

OEM Headlight bulb looks like a regular H4 to me.  

Low beam is on top

[Bone]

Looking at the picture the filament is straight wire in the OEM and coiled in the replacement.
Just another difference I noticed, without my glasses.

[Ricky-D]

I just replaced a turn signal bulb on my 2001 IS with a bulb from an auto parts store.  The bulb is a long life bulb, but in comparing the two, the OEM Stanley bulb has a support wire that stabilizes the center of the low wattage filament (the one always burning).  I have noticed that auto part store headlight bulbs don't last as long as the OEM bulbs and am now wondering if the OEM headlight bulbs have a similar support wire that contributes to a longer life.   So, is there a "motorcycle" version of lamps because of the increased vibration on a bike..... Anyone have a OEM headlight bulb to inspect?

You are correct!

The heavy duty (rough service) bulbs have the additional support for the filament.

Costs a little more, gives longer life to the bulb.

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