Lighting-Gallery.net
Lamps => Modern => Topic started by: toomanybulbs on March 21, 2012, 08:41:08 PM
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http://dayton.craigslist.org/ele/2914314726.html
iirc arc tube blackening is what makes them cycle at eol.
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They are certainly well used, could be EoL. Been my experience that some EOL's look like that, but others will be completely dark on the tube.
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They look a bit toasted to me, the seller doesn't state the duty cycle so they could have been on 24/7!
BG
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I think they are, or at least very close
I have few EOL HPS lamps that will cycle only when they want to, and not allways - probbly depends on the line voltage at the moment, and as i noticed, on the _ignitor_ in the fixture (yep the ignitor will sometimes be the one to repeatedly kick out a lamp that would not be cycling on is own, causing it to cycle with normal cycling intervals of few minutes)
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Those HPS will tend to cycle at EoL. I would not get them if it were I personally. They just have too much life used up already.