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Xenon-filled bulbs run at higher filament temperatures than those with Krypton fill and according to info at http://www.carleylamps.com/
they provide the maximum CP/Watt, but Carley doesn't provide lumens while most other bulb manufacturers do. So I began to hunt down the information for a comparison. Along the way I found out why Xenons burned more brightly than Kryptons, at http://www.misty.com/people/don/xeincand.html which indicated that Xenon conducts heat less efficiently than Krypton, thereby allowing the filament to attain a higher temperature which roughly translates to glowing more brightly. But how much more was still the question. At http://www.vistalite.com/exp4.htm
I found information comparing bulbs filled with pure Xenon compared to those filled with a Halogen mix, but nothing specific regarding output. Nevertheless this site is informative on Xenon vs Halogen.
I finally began zeroing in on the answer at http://data.energizer.com/
Scroll down to Flashlights, under which are a list of folders; click on Bulbs and look at info under Krypton, Halogen, and Halogen-Xenon (these are the brightest according to Carley, also). For an comparison example, a Krypton-filled bulb, powered by 4D cells, running at 4.8 volts, 0.75amps, has a rated lumens of 51. A Halogen 4D cell, at 5.2 volts, 0.85amps, is rated at 86 lumens. However the Eveready site had no info on pure Xenons.
On further searching I found just that at http://www.eur.lighting.philips.com/
Click on the search button on the top. Enter "flashlight" (without the quotes) on the search line and this will open a list of available documents. The first two, denoted with four stars have the relevant information, but you need Adobe Acrobat to read them. The essential information on Xenons is in the second of the top two listed documents (halogen bulb specs are in the first doc). To continue the comparison of a typical 4D cell powered bulb, Xenons (at least those manufactured by Philips) running at 4.8 volts, 0.85amps put out 65 lumens. Similar comparisons can be made for varying voltages by comparing information at the above Eveready and Philips sites. I don't know who manufactures the Eveready bulbs, but for most of them the voltages, amperages and lumens match the Philips bulb for bulb. A few are off by some percentage, which may indicate a different source for the Eveready listed bulb.
The question I remain having is if I switch out the Carley Xenon Star that I have in my 4D Mag, for a Halogen will I get 20+ lumens. I tend to doubt this as the specs of a Carely Xenon Star for a 4D-cell are 5.3volts at 0.79amps, producing 4.2 watts. An HPR50 (halogen for a 4D-cell) on the Eveready site puts out 4.4 watts (volts X amps = Watts: 5.2 X 0.85). Do 0.2 watts more give me 20 lumens? No way, right? So where do those lumens come from? What am I missing here?
they provide the maximum CP/Watt, but Carley doesn't provide lumens while most other bulb manufacturers do. So I began to hunt down the information for a comparison. Along the way I found out why Xenons burned more brightly than Kryptons, at http://www.misty.com/people/don/xeincand.html which indicated that Xenon conducts heat less efficiently than Krypton, thereby allowing the filament to attain a higher temperature which roughly translates to glowing more brightly. But how much more was still the question. At http://www.vistalite.com/exp4.htm
I found information comparing bulbs filled with pure Xenon compared to those filled with a Halogen mix, but nothing specific regarding output. Nevertheless this site is informative on Xenon vs Halogen.
I finally began zeroing in on the answer at http://data.energizer.com/
Scroll down to Flashlights, under which are a list of folders; click on Bulbs and look at info under Krypton, Halogen, and Halogen-Xenon (these are the brightest according to Carley, also). For an comparison example, a Krypton-filled bulb, powered by 4D cells, running at 4.8 volts, 0.75amps, has a rated lumens of 51. A Halogen 4D cell, at 5.2 volts, 0.85amps, is rated at 86 lumens. However the Eveready site had no info on pure Xenons.
On further searching I found just that at http://www.eur.lighting.philips.com/
Click on the search button on the top. Enter "flashlight" (without the quotes) on the search line and this will open a list of available documents. The first two, denoted with four stars have the relevant information, but you need Adobe Acrobat to read them. The essential information on Xenons is in the second of the top two listed documents (halogen bulb specs are in the first doc). To continue the comparison of a typical 4D cell powered bulb, Xenons (at least those manufactured by Philips) running at 4.8 volts, 0.85amps put out 65 lumens. Similar comparisons can be made for varying voltages by comparing information at the above Eveready and Philips sites. I don't know who manufactures the Eveready bulbs, but for most of them the voltages, amperages and lumens match the Philips bulb for bulb. A few are off by some percentage, which may indicate a different source for the Eveready listed bulb.
The question I remain having is if I switch out the Carley Xenon Star that I have in my 4D Mag, for a Halogen will I get 20+ lumens. I tend to doubt this as the specs of a Carely Xenon Star for a 4D-cell are 5.3volts at 0.79amps, producing 4.2 watts. An HPR50 (halogen for a 4D-cell) on the Eveready site puts out 4.4 watts (volts X amps = Watts: 5.2 X 0.85). Do 0.2 watts more give me 20 lumens? No way, right? So where do those lumens come from? What am I missing here?