11   General / Off-Topic / Re: Severe weather never sleeps!  on: March 22, 2026, 12:20:20 AM 
Started by lightinglover8902 - Last post by xmaslightguy
High of 85 (with 5% humidity) here today.
A coldfront is on the way for tonight which will drop temps back into the 60's tomorrow.
 12   Lanterns/Fixtures / Modern / Re: AEL 110  on: March 21, 2026, 07:28:49 PM 
Started by Baked bagel 11 - Last post by Baked bagel 11
Yeah, private property would probably be the last hope, but that said, it seems like it was made to have better optics than a NEMA, but cheaper than a Cobra. Probably good for rural roadway lighting.
 13   Lanterns/Fixtures / Modern / Re: AEL 110  on: March 21, 2026, 03:59:34 PM 
Started by Baked bagel 11 - Last post by LightsoftheWest
I've never seen one, but finding one would probably be futile since there are probably none left anymore.
 14   General / General Discussion / Re: Gas filling in T5 fluorescent tubes (classic, HE, HO, energy saving versions)  on: March 21, 2026, 03:23:28 PM 
Started by PlasmaAddict - Last post by RRK
And finally finally! This is a nitrogen spectrum. This tube was deliberately filled with circa 3mmHg of air to demonstrate so called chemical nitrogen afterglow. I believe all of the oxygen was consumed now, so no more afterglow effect, but nitrogen still displays its funny spectrum. At first, one may thought there is some kind of interference on the camera, but no! There is none, and as a sanity check nitrogen spectrum shows the same banded spectrum also on my HP320 spectrometer and even in optical spectroscope. Molecular gases have complex electron interactions resulting in funny wide spectrums. A lot of UV is radiated, too!
 15   General / General Discussion / Re: Gas filling in T5 fluorescent tubes (classic, HE, HO, energy saving versions)  on: March 21, 2026, 03:15:00 PM 
Started by PlasmaAddict - Last post by RRK
And finally, some interesting offtopic on spectral investigations ;) A crime case of some circa 2023 recent shitty Russian 36W T8 tube from my home, probably originated from Smolensk, but not branded Russian Osram. It got mercury starved and was replaced, but I kept the tube out of curiosity. It burns dim whitish with pronounced stirations. As you can see the spectrum shows near - 100% krypton fill, and no trace of any foreign molecular gas like oxygen or nitrogen. So it got really mercury starved, not leaked! You see only very weak  mercury lines and very weak phosphor excitation, as krypton has just a weak UV and at very short wavelengths, halo phosphor is insensitive to these. I do not have a starved argon tube yet to investigate, though.

 
 16   General / General Discussion / Re: Gas filling in T5 fluorescent tubes (classic, HE, HO, energy saving versions)  on: March 21, 2026, 02:27:16 PM 
Started by PlasmaAddict - Last post by RRK
Now! Gotcha! Rather old original Italian Osram FH 21W/840 *HE*! Here I 100% agree with @James listing. Dominant krypton lines with some weak argon lines. Krypton having lower ionization potential will dominate even at low percentage.

Also, my own handmade cold cathode tube with pure krypton as a spectral reference!

 17   General / General Discussion / Re: Gas filling in T5 fluorescent tubes (classic, HE, HO, energy saving versions)  on: March 21, 2026, 02:18:24 PM 
Started by PlasmaAddict - Last post by RRK
Rather recent Chinese Osram 24W/HO 840. Still no trace of Ne, some signs of alcali earths sputtering with glow discharge at 20mA.
 18   General / Off-Topic / Re: Severe weather never sleeps!  on: March 21, 2026, 08:08:45 AM 
Started by lightinglover8902 - Last post by suzukir122
Looks like we'll be hitting the 80's here tomorrow, close to the mid 80's... with the threat of storms tomorrow as well. Severe weather threat possible.
Then Monday it'll only be 48 degrees, probably cold night Monday night as well but I forget.
Sheesh man, the temperature swings...
 19   General / General Discussion / Found a new cool site with atomic spectra visializations. Enjoy!  on: March 21, 2026, 07:26:54 AM 
Started by RRK - Last post by RRK
Look here:  https://www.atomtrace.com/elements-database/

Click the element of interest.

 20   General / General Discussion / Re: Gas filling in T5 fluorescent tubes (classic, HE, HO, energy saving versions)  on: March 21, 2026, 07:03:08 AM 
Started by PlasmaAddict - Last post by RRK
Red T5HO 24W Osram tube tortured in the name of Science! ;) Gods of fluorescents, forgive me...

Run freezed at 20mA, shot near the electrode, then at the middle of the tube, run-up full current. I believe in the blue-green area I see barium and strontium lines from atoms sputtered off the cathodes of this poor little tube. I feel the pain you suffered, won't do it any more, trust me :)

I can not see any sign of neon present. 

Also you see red phosphor YOX, Y2O3:Eu bearded red line spectrum in a full glory, here not polluted by yellow and orange bands of terbium phosphor.

Spectrum from the green tube also contains a strange peak at ~589nm, it *may be* a line from neon, but usually cathode glow of neon is dominated by slightly shorter 585nm line.
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