As for the illustration . .YOU didn't activate the initial post . . . which would have given you a RED X . . thus the logic for the ensuing addendas correction.

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::: ::: ::: ::: ::: ::: ::: :::Sir Ky . . . . . . ::: ::: ::: ::: ::: :::And I DO believe that the MANNER in which this fully associates and equates with Nostalgic Radio, is that THIS particular unit is sitting right atop of your Zenith Stratosphere console . . . right ? ::: ::: :::And in my estimation, with your giving that $349 lamp price , and cluing in on that price level, :::my humble educated estimation would be . . . NO . . . on the utilization of that utter degree of simplicity, in the testing of that lamp. ::: ::: :::Why do I say that ? . . . because, with that price level, I really think that you have one of the special UHP lamps being used in that unit. ::: ::: :::Mind you, not one of the common filamental structured lamps, but an extreme HIGH TECH variant of ye olden Tom Edison's carbon arc lamp. ::: ::: :::True, on the VERY-VERY first generations of small projos (a la Sharp), they were limping along with filamentally constructed, hi power halogens and then later on, halides, for their lamps, but now, the units seem to all be using the UHP design of lamps. ::: ::: :::WHY ? . . . just because of the greater demands on picture sizing capability, pixel elemants, and the ever desire of upping of the output brightness of the resultant LARGER projected image. ::: ::: :::Plus, the complete optics involved in the initial taking of that light source and its passage thru the picture creating process until it finally emanates from the units frontal lens . . . IS quite inefficient and LOSSY. ::: ::: :::And then, you STILL have the inverse square law of quantum physics relevant to light , that being involved in the lateral dispersion /spreading apart of the image and resultant BRIGHTNESS decline with distance, until it FINALLY reaches its screen. ::: ::: :::Gets REAL dim in a hurry doesn't it ? ::: :::Demonstrative confirmation . .? ::: ::: :::Just take a piece of white posterboard and place it 6 in from the lens and start walking away with it . ::: ::: :::In a reverse comparison . . .its likely akin to spotting a deer right at murky dusk and then raising that 9-12 power scope to eye to view, and the then resultant "Who turned off the light " syndrome. ::: ::: ::: :::I just have two aspects to bring up on those types of lamps, one being the pricing and the other being the technology of how they work. ::: ::: :::As per the justification of that pricing, being just the complexity of its design and manufacture. ::: ::: :::The things run so (bleep) HOT that forced air cooling is a MANDATE, and, as per the lamp ampuole envelope, it is operating so hot, that quartz glass had to be used in that envelope construction. ::: ::: :::As for the light intensity of the unit, its as bright as the sun ! Also, resplendently complete, and chock full of ALL different variants of undesired U/V family and Infrared components. ::: ::: :::And as for the fabrication of that glass envelope, the temp of the glass has to be VERY hot to form it outwards. For example if you go up to the melting /flowing point of steel, you will find that quartz glass is still being hard and will have to go way above that temperature before even its initial plastic state onsets. ::: ::: :::And then, one has to consider that the envelopes can not be molded and turned out "cookie cutter" fashion like cheap, common, molded glasses, bowls and cups. They need to be blown out, then formed /contoured to size within a hot hard :::carbon or ceramic mold. ::: ::: :::And then, in the manufacturing after the electrode aspect, the unit is vacuum pulled and the inert filler blend of gases used is put in at 600x atmospheric pressure. ::: ::: :::Now that you have one of the units physically designed and made, you have to now get involved with the complex control electronics involved in getting it to function. ::: ::: ::: :::That would be the old buzz word of " ballast " used in the operation of that lamp, which is more in the order of an electronic ballast, but multi echelons above it in its constant circuit monitoring, regulation and complexity. ::: ::: :::Now, in consulting the basic lamp construction below: ::: ::: ::: ::: ::: ::: ::: ::: ::: :::There, you see the presence of the small ~1 mm gap between the electrodes, now in order to initially get the lamp into operation, there is the requirement of the use of the pulsing of a 5k voltage to arc the electrodes gap and then upping :::of the power level in order to get an even stronger ionized path between the electrodes and the creation of such a power level that it is then being classified as conductive plasma. ::: ::: :::At that level of conduction the High Voltage level can then be dropped and the ~60 V run voltage is then between the electrodes and the arc will still be maintained thru that conductive plasma. ::: ::: :::BUT with the then need of constant monitoring /sampling needed to regulate that pulse width modulated supply source. ::: ::: :::Look aside, to that dedicated "ballast" board in the unit that feeds the lamp, and you will see its typical ~4 in wide X 9---12 in deep X 2 in high PCB that is just bristling with its adjunct u/p and PWM circuitry required to automatically and constantly perform and maintain those functions. ::: ::: ::: :::Soooooooo with my experience with my own 3 units, along with the Constant Collegiate Colleagues Continually Cajoling, Coaxing pleas of "Lets get Edd to look at it " situations, I once found the need of "You 'gotta BUY it to try it". ::: ::: :::OR, as I have since commonly circumvented the situation, with having so many contacts, either the borrowing of a SAME lamp from another unit for testing, or the subbing in of the questionable lamp into another working unit. ::: ::: :::Basically, I just tell the owner that I had used another persons lamp in analysis, so EXPECT that favor to be reciprocable, in case that /another persons set goes out in the future. Helps both parties ! ::: ::: :::Why . . . BECAUSE the units ballast unit could equally be the problem. Or even thermal sensors and associated control circuitry relevant to cooling / airflow which can cause fault shutdown. ::: ::: ::: :::With that new technology, your bed has been made and you just have to sleep in it, in olden CRT days, the cost of operation was less than a cent per hour on its operation during its lifespan. ::: ::: :::On the "Lamp " technology sets , expect upwards of 13 cents per hour on lamp operation costs. ::: ::: :::(Or much MORE, if you have one of those $650 lamps , for the 60 and 72 inch sets, and their typical 2-3 year lifespan.) ::: ::: ::: ::: :::Ongoing Failure Analysis: ::: ::: :::The high pressure gas environment along with the gas blend slows the depletion of the tungsten electrodes, but with time, the gap opens up and a wider arc ups the temperature and with time, the increasing heat along with clogging of the NEGLECTED filters in the air supply flow can cause that internal lamp ampuole to go "PING". ::: ::: :::In that particular situation, it is a no brainer to see the halved remnants hanging and the loose shards of glass inside the larger outer envelope. ::: ::: :::ALSO, on time use onset , in the close inspecting of internal mirror surfacing with a stereo microscope, I am finding a fine, continually widening black "spider webbing" occuring on the mirror surfacing, thus onsetting a progressive decline of its reflective and light focusing / gathering capabilities. ::: ::: :::Do note that about all of the light from the internal ampuole emanates to its side and is then dependent for the ovoid mirrors :::parabolic shaping to direct the light output forward from the lamp. ::: ::: :::Thassssit ::: ::: ::: :::Pee Ess . . . . .why not Edd-i-cate yourself even a bit more, with the specifics of the "forerunner" Philips UHP lamp. ::: ::: ::: ::: ::: :::> > > > > > me . . . me . . click on ME ! < < < < < < ::: ::: ::: ::: ::: ::: ::: ::: ::: :::73's de Edd ::: ::: ::: :::

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