Return to the thumbnail page Display/hide file information See previous file See next file

Narva NF80 after 2h use on 400W HPS ballast

Narva NF80 after 2h use on 400W HPS ballast

Click to view full size image

The arc was before , of course smaller in diameter, and it was completely black, now grey.
It still works on 400W ballast.

DSC01409lg.jpg DSC01394lg.jpg DSC01384lg.jpg DSC01379lg.jpg

Light Information

Light Information

Manufacturer:NARVA
Model Reference:NF
Lamp
Lamp Type:MV
Base:E27
Physical/Production
Factory Location:GDR
Fabrication Date:1989

File information

File information

Download: Download this File
Filename:DSC01384lg.jpg
Album name:magslight / lamps
Keywords:Lamps
File Size:389 KB
Date added:Oct 23, 2020
Dimensions:1500 x 1323 pixels
Displayed:120 times
Date Time:2020:10:23 11:29:31
DateTime Original:2020:10:23 11:29:31
Exposure Bias:0 EV
Exposure Time:1/30 sec
FNumber:f 3
Flash:Flash
Focal length:4.5 mm
ISO:80
Make:SONY
Model:DSC-H300
Software:4.0000
White Balance:0
URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-187879
Favorites:Add to Favorites
Comments
dor123
Hero Member
*****
Offline

Gender: Male
View Posts
View Gallery
Other loves are computers, office equipment, A/Cs


View Profile WWW Offline
Oct 23, 2020 at 07:26 AM Author: dor123
Why the arctube turned from black to gray? If the electrodes have the white coating, so it should turn white/gray, than black.

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.

Max
Jr. Member
**
Offline

View Posts
View Gallery


View Profile Offline
Oct 23, 2020 at 07:57 AM Author: Max
Looks like you found a way to "regenerate" worn out mercury lamps. Does it still light up on a standard 80 W HPM ballast? If so, I bet it puts out much more light than before the treatment with the 400 W ballast.

dor123 - It's likely that the extreme burner temperature at 400 W led to the oxidation of the black tungsten layer by the quartz wall, with silicon released as a result.
dor123
Hero Member
*****
Offline

Gender: Male
View Posts
View Gallery
Other loves are computers, office equipment, A/Cs


View Profile WWW Offline
Oct 23, 2020 at 07:59 AM Author: dor123
But there is no oxygen inside the arctube and the outerbulb.

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.

Max
Jr. Member
**
Offline

View Posts
View Gallery


View Profile Offline
Oct 23, 2020 at 07:59 AM Author: Max
The oxygen comes from SiO2 (quartz) which reacts with tungsten at very high temperature.
magslight
Full Member
***
Offline

Gender: Male
View Posts
View Gallery


View Profile WWW Offline
Oct 23, 2020 at 10:23 AM Author: magslight
@Max: Yes you're right. The lamp is now brighter than before. It works perfectly on 80W HPM ballast, but on 400WHPS ballast it was much brighter
Max
Jr. Member
**
Offline

View Posts
View Gallery


View Profile Offline
Oct 23, 2020 at 11:13 AM Author: Max
Once I ran a 50 W mercury lamp on a 1000 HPM ballast. I really expected the lamp to fail violently, but no, it ran "fine" although the burner quadrupled in volume and became spherical. It was also very bright though
wide-lite 1000
Hero Member
*****
Offline

Gender: Male
View Posts
View Gallery


View Profile Offline
Oct 23, 2020 at 10:45 PM Author: wide-lite 1000
@ Max : So basically you created a 50w MV Powerball lamp !

Collector,Hoarder,Pack-rat! Clear mercury Rules!!

Max
Jr. Member
**
Offline

View Posts
View Gallery


View Profile Offline
Oct 24, 2020 at 09:09 AM Author: Max
Yes, absolutely The quartz wall was stretched to a paper-thin membrane (for lack of a better word) and I doubt the internal pressure was much higher than an atmosphere.
magslight
Full Member
***
Offline

Gender: Male
View Posts
View Gallery


View Profile WWW Offline
Oct 24, 2020 at 09:37 AM Author: magslight
Do you still have that lamp ?
Max
Jr. Member
**
Offline

View Posts
View Gallery


View Profile Offline
Oct 24, 2020 at 09:40 AM Author: Max
No, that was more than a decade ago, I've moved places twice since then and the lamp is long gone.
© 2005-2020 Lighting-Gallery.net | Powered by: Coppermine Photo Gallery