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Light bulb question -- Daniel Stern?



 
 
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Old October 31st 04, 12:36 AM
Shep
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Amen on the short lived Silstar, went thru a set in 7 months on my chev.
trailblazer, bitched to them, got another set on warranty, 7 months later,
one right after another. It's a shame because they were good, and the
stockers stink.
"Daniel J. Stern" > wrote in message
n.umich.edu...
> On Sat, 30 Oct 2004, Minnie Bannister wrote:
>
>> Went to the Sylvania Web site to see whether XtraVision bulbs are
>> available for my 300M (they aren't) and looked at the comparison chart
>> for Standard, XtraVision, Cool Blue, and SilverStar. I was surprised to
>> see that for a given bulb type (e.g., 9004, 9005, 9006) they quote the
>> same light output in lumens no matter whether it's a Standard or an
>> XtraVision! So how come they claim that XtraVision are "brighter"?

>
> Sylvania primarily lists *NOMINAL* output, not actual, in their materials.
> Nominal output is the legal spec contained in Federal code 49CFR564. The
> spec for each bulb contains a nominal flux as well as the allowable
> tolerance range as either a plus-minus percentage or an absolute maximum.
> Take a look for yourself he
> http://fmvss108.tripod.com/light_source_list.htm and you'll see how
> coincidentally all those Sylvania bulbs just happen to (be claimed to
> produce) exactly the nominal value, right on the nose. Quoting nominal
> values is the same as saying "These bulbs are all legal". Sure they are,
> but nominal values do not describe the differences in performance amongst
> the different bulbs. Can you think of a reason why Silverstar (which
> produces near the high end of the legal output) and Cool Blue (which
> produces near the low end) would be quoted at nominal rather than actual?
> I can. I can also think of a reason why Sylvania would field a gimmicky,
> expensive, short-lived, low-performing Silverstar for your 300M but *not*
> a higher-performing, non-gimmicky, longer-lived, less-expensive
> Xtravision.
>
> DS
>
>





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