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Standing waves in an Osram Smartlux T5 HE 28W/865, near the air compressor room

Standing waves in an Osram Smartlux T5 HE 28W/865, near the air compressor room


I think that the lamp getting impurities, as this shouldn't occur in lamp that operates in full brightness.

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Date added:Jun 20, 2019
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halofosfaatti
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Jun 20, 2019 at 07:09 AM Author: halofosfaatti
Why you call these standing waves? I think they are striations, normal phenomenon on low pressure gas discharge, sometimes they can appear on neon lamps and other discharge lamps. Wikipedia says that striations are quantum mechanical effect caused by energy releasing at discrete energy levels. But they are uncommon at full brightness fluorescents. Their motion can be caused by lamp electrical characteristics changing during warm up. Some electronic ballast make striations appear often even on full brightness lamps. I don't know the reason, but it is possibly caused by the stability of electronic ballast.

Too many things are secret. Only open information can really preserve old technology.

I like fluorescent and other conventional lighting and old electronic equipment. Today's things are not made to last.

dor123
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Jun 20, 2019 at 07:20 AM Author: dor123
Usually this appears on tubes operated at high frequency. Only rarely this appears on tubes operates at mains frequency. This form of striations is officially called standing waves.

I"m don't speak English well, and rely on online translating to write in this site.
Please forgive me if my choice of my words looks like offensive, while that isn't my intention.

I only working with the European date format (dd.mm.yyyy).

I lives in Israel, which is a 230-240V, 50hz country.

halofosfaatti
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Jun 20, 2019 at 07:25 AM Author: halofosfaatti
I have seen these on warming up rapid start lamps as well (on magnetic ballast). Maybe the gas filling made they more visible. It is possibly the current on warmed up lamps that is so irregular that it makes these disappear. I don't really know. Standing waves are also common physical phenomenon. https://en.m.wikipedia.org/wiki/Standing_wave

Too many things are secret. Only open information can really preserve old technology.

I like fluorescent and other conventional lighting and old electronic equipment. Today's things are not made to last.

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