Maybe it can, but do you have evidence or can you point to any science. I'm open to believing it, I just haven't seen anything that makes it more than a wives tale to this point.Have you ever started a fire with a magnifying glass? Oil can do the same thing. It can concentrate heat and light.
You want to experiment? Okay, do this:No wives tail? You just recited something that makes no sense to me. A mineral glass, quartz, etched by skin oil? I would like to see that experiment. Interesting that there is no solid science anywhere on this.
Most well known reputable halogen lamp manufacturers advise handling the lamp with cotton gloves or even provide a paper tag to do it with.
Having had one of these blow apart in front of my face, I now have a healthy respect for these things. Not only would I not touch them with a finger, but a ten foot barge pole as well. There are few reasons to use these for lighting now. The downlighter (MR16 or GU10) types over 20-W get dangerously hot in my opinion.
I believe the reason fingerprints are bad on a quartz bulb are the sodium and potassium ions from your sweat react with the silicon dioxide of the quartz to form sodium silicate which is ordinary glass with a much lower melting point than quartz.You want to experiment? Okay, do this:
1) Apply a fingerprint to a quartz bulb.
2) Turn on said bulb for two hours at max output.
3) Observe the fingerprint, now etched into the glass.
4) Confirm etching by trying to remove said fingerprints with various cleaning agents.
Here's a picture of a fingerprint etched in a quartz bulb.
View attachment 109202
Fingerprint: Oils from fingerprints and other contaminations
on quartz bulbs causes a divitrification chemical reaction when
bulb is heated. Quartz glass crystallizes becoming brittle causing
premature glass failure (bulb could explode.) Remove all
contamination from glass before installing.
Are you talking about the bulbs I posted or something else?BTW, these present as an almost completely resistive load, so even low cost dimmers will control them well as long as they are rated appropriately for power. Powering them via a transformer to get a specific voltage makes this into a load with a considerable inductive component and is not for the faint of heart.
That is the reason I have been given also.I was told by an engineer it was the finger oil. The oil absorbs heat and has the duration for a very hot spot. Bing.
No wives tail? You just recited something that makes no sense to me. A mineral glass, quartz, etched by skin oil? I would like to see that experiment. Interesting that there is no solid science anywhere on this.
No small print text on the ceramic end? No model number of manufacturer?Bulb - looks just about exactly like this one:
But instead of them being $5-14 each, I found them for $.20 each.... and they have cases of broken ones and I was wondering what the inner metal part is and if it could be used in custom glass blown bulbs like back in the Edison days when bulbs never died...
I was wondering if this could be run on rectified DC from 120AC. Isn't there something like a 1.4141 conversion rate from AC to DC rectification? 120 * 1.4141 would give just above 165v
Yes. The photo and description fits perfectly. As far as controlling them, it's most common to use phase angle controllers to control AC. Theoretically, DC should work, but is not a common practice. Depending on what you want to use these for, you may be pleasantly surprised at how well 165 v lamps will work on 120v - no controller needed.Are you talking about the bulbs I posted or something else?
by Jake Hertz
by Aaron Carman
by Jake Hertz
by Aaron Carman