I probably spend a little too much time playing with 9011 bulbs but I found some interesting things.
I was pulling up on the driveway last night and I noticed that one high-beam appeared to be a bit "brighter" than the other on my garage wall.
I have both a Philips 9011 and a Sylvania (Osram) 9011 in the car.
All my bulbs in this vehicle are hooked up to a heavy duty wiring harness, and I swapped the bulbs from left to right to tease out any voltage drop differences. Nope, no voltage drop differences--the Sylvania/Osram 9011 puts out a slightly "whiter" spot of light on the garage wall.
I noticed that the Osram 9011 has the more modern H7-type filament architecture, while the Philips doesn't. The Osram is also made in Korea, while the Philips is made in Germany. I remember that Candlepower, Inc. used to (or still does) advertise a "3rd gen" Philips/Osram/Vosla 9011 bulb. But it appears that the Osram and Philips 9011 bulbs are different now; they're even made in different countries with different physical characteristics. The Vosla (judging from Google Images) resembles the Philips; the Osram appears to be a unique, separate design.
https://imgur.com/a/W1otS9l
I also noticed that the Osram 9011 has a slightly smaller capsule, almost like a Philips 9012LL capsule. Here are my diameter measurements with a caliper:
Philips 9012LL: 5.45mm
Philips 9011: 5.72mm
Sylvania 9005LL: 5.80mm
Sylvania (Osram) 9011: 5.50mm
Finally, it seems that the Sylvania/Osram 9011 has an iridescent coating, while the Philips 9011 (and the Sylvania 9005) are uncoated. The Sylvania/Osram 9011 exhibits glints of purple when holding it up to the light.
Could this all be explained by a hotter running filament in the Sylvania/Osram 9011? I mean, the bulb capsule is smaller, so that should (slightly) increase filament temperature, correct? Plus, it really does seem like the Sylvania/Osram 9011 has the infrared reflective coating given its iridescence. Could it be that the Sylvania 9011 is superior to the Philips/Vosla 9011?
Finally, on an unrelated note, I found that the Toshiba 9011 has a ring on top of the bulb capsule. What is this, a premonition of bulb failure--some sort of stress on the bulb capsule?
https://imgur.com/a/nJiNtzr
I was pulling up on the driveway last night and I noticed that one high-beam appeared to be a bit "brighter" than the other on my garage wall.
I have both a Philips 9011 and a Sylvania (Osram) 9011 in the car.
All my bulbs in this vehicle are hooked up to a heavy duty wiring harness, and I swapped the bulbs from left to right to tease out any voltage drop differences. Nope, no voltage drop differences--the Sylvania/Osram 9011 puts out a slightly "whiter" spot of light on the garage wall.
I noticed that the Osram 9011 has the more modern H7-type filament architecture, while the Philips doesn't. The Osram is also made in Korea, while the Philips is made in Germany. I remember that Candlepower, Inc. used to (or still does) advertise a "3rd gen" Philips/Osram/Vosla 9011 bulb. But it appears that the Osram and Philips 9011 bulbs are different now; they're even made in different countries with different physical characteristics. The Vosla (judging from Google Images) resembles the Philips; the Osram appears to be a unique, separate design.
https://imgur.com/a/W1otS9l
I also noticed that the Osram 9011 has a slightly smaller capsule, almost like a Philips 9012LL capsule. Here are my diameter measurements with a caliper:
Philips 9012LL: 5.45mm
Philips 9011: 5.72mm
Sylvania 9005LL: 5.80mm
Sylvania (Osram) 9011: 5.50mm
Finally, it seems that the Sylvania/Osram 9011 has an iridescent coating, while the Philips 9011 (and the Sylvania 9005) are uncoated. The Sylvania/Osram 9011 exhibits glints of purple when holding it up to the light.
Could this all be explained by a hotter running filament in the Sylvania/Osram 9011? I mean, the bulb capsule is smaller, so that should (slightly) increase filament temperature, correct? Plus, it really does seem like the Sylvania/Osram 9011 has the infrared reflective coating given its iridescence. Could it be that the Sylvania 9011 is superior to the Philips/Vosla 9011?
Finally, on an unrelated note, I found that the Toshiba 9011 has a ring on top of the bulb capsule. What is this, a premonition of bulb failure--some sort of stress on the bulb capsule?
https://imgur.com/a/nJiNtzr
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