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2 8w tubes i made with different gas pressure One has 10 milibars of argon in and one has only 6. I'm curious to see what differences develop between the two. As it is the 10 milibar one starts more easily than the 6 milibar one and it has a greener tint than the 6 milibar lamp which looks slightly pink and is a little dimmer considering they were both made from the same length of 840 phosphored tubing. Im also expecting the 6 milibar one to band and have a shorter life than the 10 milibar one with that one not banding at all Hopefully I can convince dan to 24/7 them for me to test this.

2 8w tubes i made with different gas pressure

One has 10 milibars of argon in and one has only 6. I'm curious to see what differences develop between the two. As it is the 10 milibar one starts more easily than the 6 milibar one and it has a greener tint than the 6 milibar lamp which looks slightly pink and is a little dimmer considering they were both made from the same length of 840 phosphored tubing. Im also expecting the 6 milibar one to band and have a shorter life than the 10 milibar one with that one not banding at all

Hopefully I can convince dan to 24/7 them for me to test this.

387A3410b.jpg IMG_20160325_142528.jpg IMG_9910cp.JPG DPP00003333.JPG 830t5.jpg
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Filename:20190930_165901.jpg
Album name:eclipsislamps / Dodgy experiments
Filesize:1300 KiB
Date added:30 Sep, 2019
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Lightbulbfun   [01 Oct, 2019 at 10:23 PM]
im curious how their electricial specs (like arc voltage drop) compare between the 2 as I know buffer gas pressures can have a big affect on that Smile
eclipsislamps   [02 Oct, 2019 at 08:34 PM]
Well this experiment proves that is incorrect the voltage across these is the same. 59v to be precise
Lightbulbfun   [03 Oct, 2019 at 10:00 PM]
interesting Smile i wonder what determines a lamps arc voltage exactly, take a 2ft 40W tube, it has an arc voltage of just 45-48V compared to the 55-60V of a 20W T12
eclipsislamps   [04 Oct, 2019 at 08:14 AM]
Thats because of the increased current its why they are considered to have 'negative' resistance, as the current increases the voltage drop reduces
Ash   [04 Oct, 2019 at 02:10 PM]
Eclipsis And What about the off period at current zero crossings ? Is that same too ? I would like to see scope pics
eclipsislamps   [04 Oct, 2019 at 03:41 PM]
Id be curious to have a look ill see if i can get access to a scope

Comment 1 to 6 of 6
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