Phil Hobbs wrote:> > On 10/11/2012 07:18 PM, Dave Plowman (News) wrote: > > In article<ju2e78dvhsud46mljvoujn8kn69bqikpjr@4ax.com>, > > Jeff Liebermann<jeffl@cruzio.com> wrote: > >> The lobby and foyer lights were mounted on the ceiling, pointing down. > >> One would think that there would be plenty of hot air accumulating > >> near the ceiling, but that wasn't the case. That's where the fan > >> ducts were located which helped to cool the lights. Few of those > >> lights ever burned out. > > > >> The marquee lamps were mounted on a vertical structure, with the lamps > >> pointed horizontally. > > > > Vertical mounting for a GLS lamp seems to give a better life than other > > orientations. A rough service type may have had a better life in this > > application. > > > > The filament temperature goes up more slowly than the ambient, since > it's radiatively cooled, but a rise of, say, 50 degrees would probably > have a significant effect on bulb life.The projector bulbs in the old RCA TP66 film chain were mounted in a vertical line. If you used the bottom lamp, and let it switch the to spare on top, they had a short life of a little over 20 hours. If you ran the top lamp, with the spare at the bottom, the life was over five times longer. The projector used a motorized track, with a relay in series with the filament. When the filament opened, the relay dropped out and turned on the motor. In either position, it would run to look for the other bulb when the one in use failed. I would pull the bad lamp and move the good lamp to the top at the next film change, then put the new lamp in the bottom socket. I averaged over 130 hours per lamp, that way.
Using mobile phone as an internet radio
Started by ●October 2, 2012
Reply by ●October 12, 20122012-10-12
Reply by ●October 13, 20122012-10-13
On 10/12/2012 01:38 PM, Michael A. Terrell wrote:> > Phil Hobbs wrote: >> >> On 10/11/2012 07:18 PM, Dave Plowman (News) wrote: >>> In article<ju2e78dvhsud46mljvoujn8kn69bqikpjr@4ax.com>, >>> Jeff Liebermann<jeffl@cruzio.com> wrote: >>>> The lobby and foyer lights were mounted on the ceiling, pointing down. >>>> One would think that there would be plenty of hot air accumulating >>>> near the ceiling, but that wasn't the case. That's where the fan >>>> ducts were located which helped to cool the lights. Few of those >>>> lights ever burned out. >>> >>>> The marquee lamps were mounted on a vertical structure, with the lamps >>>> pointed horizontally. >>> >>> Vertical mounting for a GLS lamp seems to give a better life than other >>> orientations. A rough service type may have had a better life in this >>> application. >>> >> >> The filament temperature goes up more slowly than the ambient, since >> it's radiatively cooled, but a rise of, say, 50 degrees would probably >> have a significant effect on bulb life. > > > The projector bulbs in the old RCA TP66 film chain were mounted in a > vertical line. If you used the bottom lamp, and let it switch the to > spare on top, they had a short life of a little over 20 hours. If you > ran the top lamp, with the spare at the bottom, the life was over five > times longer. The projector used a motorized track, with a relay in > series with the filament. When the filament opened, the relay dropped > out and turned on the motor. In either position, it would run to look > for the other bulb when the one in use failed. I would pull the bad > lamp and move the good lamp to the top at the next film change, then put > the new lamp in the bottom socket. I averaged over 130 hours per lamp, > that way.That's interesting--just storing the bulb at higher temperature reduced its life that badly, even if it wasn't energized? The only mechanism I can think of for that is that they leaked and let oxygen in. Otherwise glass and metal should be unaffected by ~100 C temperatures. But then they should leak even worse when energized. Another mystery, Scoob. Hot tungsten doesn't have a very high emissivity in the IR, so probably the filament temperature is more sensitive to ambient temperature than one would expect from the T**4 dependence from Stefan's law for black bodies. Raising the temperature by 1 degree at 3000 K makes the radiation go up by 1000 times more than at 300 K, so the filament regulates its own temperature quite closely if it's really a black body. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC Optics, Electro-optics, Photonics, Analog Electronics 160 North State Road #203 Briarcliff Manor NY 10510 hobbs at electrooptical dot net http://electrooptical.net
Reply by ●October 13, 20122012-10-13
Phil Hobbs wrote:> > On 10/12/2012 01:38 PM, Michael A. Terrell wrote: > > > > Phil Hobbs wrote: > >> > >> On 10/11/2012 07:18 PM, Dave Plowman (News) wrote: > >>> In article<ju2e78dvhsud46mljvoujn8kn69bqikpjr@4ax.com>, > >>> Jeff Liebermann<jeffl@cruzio.com> wrote: > >>>> The lobby and foyer lights were mounted on the ceiling, pointing down. > >>>> One would think that there would be plenty of hot air accumulating > >>>> near the ceiling, but that wasn't the case. That's where the fan > >>>> ducts were located which helped to cool the lights. Few of those > >>>> lights ever burned out. > >>> > >>>> The marquee lamps were mounted on a vertical structure, with the lamps > >>>> pointed horizontally. > >>> > >>> Vertical mounting for a GLS lamp seems to give a better life than other > >>> orientations. A rough service type may have had a better life in this > >>> application. > >>> > >> > >> The filament temperature goes up more slowly than the ambient, since > >> it's radiatively cooled, but a rise of, say, 50 degrees would probably > >> have a significant effect on bulb life. > > > > > > The projector bulbs in the old RCA TP66 film chain were mounted in a > > vertical line. If you used the bottom lamp, and let it switch the to > > spare on top, they had a short life of a little over 20 hours. If you > > ran the top lamp, with the spare at the bottom, the life was over five > > times longer. The projector used a motorized track, with a relay in > > series with the filament. When the filament opened, the relay dropped > > out and turned on the motor. In either position, it would run to look > > for the other bulb when the one in use failed. I would pull the bad > > lamp and move the good lamp to the top at the next film change, then put > > the new lamp in the bottom socket. I averaged over 130 hours per lamp, > > that way. > > That's interesting--just storing the bulb at higher temperature reduced > its life that badly, even if it wasn't energized? The only mechanism I > can think of for that is that they leaked and let oxygen in. Otherwise > glass and metal should be unaffected by ~100 C temperatures. But then > they should leak even worse when energized. Another mystery, Scoob. > > Hot tungsten doesn't have a very high emissivity in the IR, so > probably the filament temperature is more sensitive to ambient > temperature than one would expect from the T**4 dependence from Stefan's > law for black bodies. Raising the temperature by 1 degree at 3000 K > makes the radiation go up by 1000 times more than at 300 K, so the > filament regulates its own temperature quite closely if it's really a > black body.The glass on these projection lamps was usually distorted, by the time they failed.
Reply by ●October 13, 20122012-10-13
On 2012-10-12, Michael A. Terrell <mike.terrell@earthlink.net> wrote:> The projector bulbs in the old RCA TP66 film chain were mounted in a > vertical line. If you used the bottom lamp, and let it switch the to > spare on top, they had a short life of a little over 20 hours. If you > ran the top lamp, with the spare at the bottom, the life was over five > times longer. The projector used a motorized track, with a relay in > series with the filament. When the filament opened, the relay dropped > out and turned on the motor. In either position, it would run to look > for the other bulb when the one in use failed. I would pull the bad > lamp and move the good lamp to the top at the next film change, then put > the new lamp in the bottom socket. I averaged over 130 hours per lamp, > that way.Are you saying that 20 hours resting above the working lamp knocked 100 hours off the lifeime? in other words, I f you did the opposite did that reduce the life of every lamp to 20 hours. Or was it 130 hours above the working lamp that reduced the life of the spare by 100 hours? It seems surprising that the lamps were so readily damaged by environmental heat -- ⚂⚃ 100% natural --- news://freenews.netfront.net/ - complaints: news@netfront.net ---
Reply by ●October 15, 20122012-10-15
Jasen Betts wrote:> > On 2012-10-12, Michael A. Terrell <mike.terrell@earthlink.net> wrote: > > > The projector bulbs in the old RCA TP66 film chain were mounted in a > > vertical line. If you used the bottom lamp, and let it switch the to > > spare on top, they had a short life of a little over 20 hours. If you > > ran the top lamp, with the spare at the bottom, the life was over five > > times longer. The projector used a motorized track, with a relay in > > series with the filament. When the filament opened, the relay dropped > > out and turned on the motor. In either position, it would run to look > > for the other bulb when the one in use failed. I would pull the bad > > lamp and move the good lamp to the top at the next film change, then put > > the new lamp in the bottom socket. I averaged over 130 hours per lamp, > > that way. > > Are you saying that 20 hours resting above the working lamp knocked 100 > hours off the lifeime? In other words, if you did the opposite did that > reduce the life of every lamp to 20 hours.It did it to three in a row. We were on the air with film for about 75 hours a week, on a two projector film chain. We were issued six lamps for three months, then had to find other sources.> Or was it 130 hours above the working lamp that reduced the life of > the spare by 100 hours? > > It seems surprising that the lamps were so readily damaged by > environmental heatThey were in a steel & aluminum box with little ventilation, and in a non air conditioned environment. the control room could reach 95 degrees on summer afternoons. The glass would distort & sag before the filament opened. The projectors were run off a motorized Sola Adjust-A-Volt to keep the line voltage at 120 V. It was used instead of a CVT, because of the cap run motors in the projectors. You couldn't leave the doors open, because wild animals would come into the building. The only thing that couldn't were the huge buffalo that wouldn't fit through the door.
Reply by ●October 21, 20122012-10-21
"Rocky" <wookiee@att.net> wrote in message news:Wb6dnYuYPImB1fHNnZ2dnUVZ_tidnZ2d@giganews.com...> > "William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message > news:k4hen1$ngj$1@dont-email.me... >>>> Using anything shortens its working life. >> >>> I can vouch for the remark made but I can give you more details too: >> >>> I use smartphones, tablets and laptops to listen to internet radio all >>> the >>> time and I've only had one device that suffered because of that. What >>> happened to that particular device is the WiFi quit working and it >>> doesn't >>> even work after a factory reset. >> >> Who knows why the WiFi quit? The radio could have failed simply because >> the >> chip went bad. >> >> HP has had problems with the radios in some of its notebooks. > > Yes, I've heard that and I've even seen one person that no longer has WiFi > on their HP notebook but they claimed it was the switch itself that quit > working so I try not to use the hardware WiFi switch on an HP notebook. > > Me, I've had a power plug fail on an HP ZD7000 notebook and that was > common for that particular notebook. > > I've also had a DVD fail on an HP DV8000 notebook but when the second DVD > failed too I went back to the first DVD and it has been working fine since > then. I doubt if I'll ever figure that one out unless if it was a problem > with the connector. > > Other than that, I've seen a lot of videos on youtube with problematic HPs > where if it isn't the WiFi that goes out it is the video. Case in point: > > HP 's Worst Laptop Ever - Pavilion ZD8000 - > http://www.youtube.com/watch?v=2stqQtQePcM&hd=1 > > Oddly enough I skipped getting the HP ZD8000 because I went from an HP > ZD7000 to the HP DV8000 where the ZD8000 looks more like the ZD7000 than > the DV8000. > > FYI the only device I had that lost the WiFi was a Pharos Traveler 137 > that I got real cheap when a place was getting rid of them so I wasn't too > upset when the WiFi quit on that. >><http://www.pharosgps.com/products/proddetail.asp?prod=001_PTL137_8.00><FYI I recently copied a bunch of songs up to a micro SDHC card and I can still use bluetooth A2DP to play those songs through the speakers connected to a laptop with bluetooth. So that means even though the WiFi quit working on the device mentioned above the bluetooth still seems to work OK so they must not be using the same transmitter or same receiver. http://www.mobileburn.com/definition.jsp?term=A2DP Rocky
Reply by ●October 21, 20122012-10-21
On Sun, 21 Oct 2012 10:13:46 -0500, "Rocky" <wookiee@att.net> wrote:> >"Rocky" <wookiee@att.net> wrote in message >news:Wb6dnYuYPImB1fHNnZ2dnUVZ_tidnZ2d@giganews.com... >> >> "William Sommerwerck" <grizzledgeezer@comcast.net> wrote in message >> news:k4hen1$ngj$1@dont-email.me... >>>>> Using anything shortens its working life. >>> >>>> I can vouch for the remark made but I can give you more details too: >>> >>>> I use smartphones, tablets and laptops to listen to internet radio all >>>> the >>>> time and I've only had one device that suffered because of that. What >>>> happened to that particular device is the WiFi quit working and it >>>> doesn't >>>> even work after a factory reset. >>> >>> Who knows why the WiFi quit? The radio could have failed simply because >>> the >>> chip went bad. >>> >>> HP has had problems with the radios in some of its notebooks. >> >> Yes, I've heard that and I've even seen one person that no longer has WiFi >> on their HP notebook but they claimed it was the switch itself that quit >> working so I try not to use the hardware WiFi switch on an HP notebook. >> >> Me, I've had a power plug fail on an HP ZD7000 notebook and that was >> common for that particular notebook. >> >> I've also had a DVD fail on an HP DV8000 notebook but when the second DVD >> failed too I went back to the first DVD and it has been working fine since >> then. I doubt if I'll ever figure that one out unless if it was a problem >> with the connector. >> >> Other than that, I've seen a lot of videos on youtube with problematic HPs >> where if it isn't the WiFi that goes out it is the video. Case in point: >> >> HP 's Worst Laptop Ever - Pavilion ZD8000 - >> http://www.youtube.com/watch?v=2stqQtQePcM&hd=1 >> >> Oddly enough I skipped getting the HP ZD8000 because I went from an HP >> ZD7000 to the HP DV8000 where the ZD8000 looks more like the ZD7000 than >> the DV8000. >> >> FYI the only device I had that lost the WiFi was a Pharos Traveler 137 >> that I got real cheap when a place was getting rid of them so I wasn't too >> upset when the WiFi quit on that. >>><http://www.pharosgps.com/products/proddetail.asp?prod=001_PTL137_8.00>< > >FYI I recently copied a bunch of songs up to a micro SDHC card and I can >still use bluetooth A2DP to play those songs through the speakers connected >to a laptop with bluetooth. So that means even though the WiFi quit working >on the device mentioned above the bluetooth still seems to work OK so they >must not be using the same transmitter or same receiver.They don't. The antennas are separate, even.> http://www.mobileburn.com/definition.jsp?term=A2DP
