Re: new lightbulbs


"Depresion" <127.0.0.1> wrote in message
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"JB" <nil@xxxxxxxx> wrote in message
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"JB" <nil@xxxxxxxx> wrote in message
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"DervMan" <thedervman@xxxxxxxxx> wrote in message
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Whilst clearing out part of our office / spare room / junk room, I
rediscovered some Osram Silverstar bulbs that I picked up a couple of
years ago. Still in their original packaging.

These have the envious reputation of being placed pretty much at the
bottom of their class when Autoexpress* tested them. What the heck, I
put them into the 9-3... so ooooh another modification post. :)

*I think it was Autoexpress that did a H4 comparison.

Both Osram SilverStars and Philips Vision Plus lamps are about the best
performing (non-HID) automotive lamps there are. Assuming like for like
wattage they provide far, far better peak beam candelas than standard
halogen lamps and especially the *truly* *** 'blue-beam' offerings.
Some lamps produced by Narva/Ring and PIAA come close to the lumen
output of the Osram/Philips but are not as well designed or assembled.
For example, I tested some H1 halogens in standard, Silverstar/Vison
Plus, and some 'blue' halogens in out lamp test system here in our labs
at work. If you normalise the data and say that standard 12v 55W H1
halogen lamps are 100% lumen output, the Silverstar/Vision Plus
produced 141% and 147% respectively and the 2 different blue types
produced 59% and 63% respectively.


Goodo. Just out of interest, what was the variance on your samples?
Autoexpress reckoned that some bulbs were so variable, you might get a
good pair, you might not...

--
With the 10 samples of the Osram and 10 Philips lamps, the total spread
of lumen output was 3.2% and 2.8% repectively.

Is that 10 bulbs or 10 pairs? Were you testing in a vehicle or just the
bulb? Strange question I know but the position of the filament in a
reflector can have an impact. (One of the problems I've seen with cheap
HID kits)
10 lamps from each manufacturer (I tested over 100 H1 lamps in total).
Testing was in an integrating sphere with an Ocean Optics spectrometer. I
agree that filament (or arc) location accuracy is absolutely critical in
automotive optics. A mm off axis and the beam quality becomes total ***.
Anothe problem with HID retrofits is that the actual luminous portion of the
arc itself is substantially larger than that of a filament lamp, causing
poor focussing and softening of the beam.

JB


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