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Medium Pressure Mercury Vapour amp Osram 400W mercury lamp type MA/V with some hours on it. This lamp works fine but on very close inspection the start series resistor is detached from the circuit by less than a mm. As the outer jacket is at low pressure but not a good vacuum a conduction path across the gap allows the lamp to start normally. Keywords: Lamps

Medium Pressure Mercury Vapour amp

Osram 400W mercury lamp type MA/V with some hours on it. This lamp works fine but on very close inspection the start series resistor is detached from the circuit by less than a mm. As the outer jacket is at low pressure but not a good vacuum a conduction path across the gap allows the lamp to start normally.

UVC_PL.jpg Ph_QL.jpg MAV400.JPG STELLA250.jpg DSC_6296.JPG
Lamp/Fixture Information
Manufacturer:Osram
Model Reference:MA/V
Lamp
Lamp Type:medium pressure mercury
File information
Filename:MAV400.JPG
Album name:Tuopeek / Mercury Vapour
Keywords:Lamps
Filesize:234 KiB
Date added:25 Jul 2024
Dimensions:2500 x 1564 pixels
Displayed:86 times
DateTime Original:2024:07:25 09:37:04
Exposure Time:1/250 sec
FNumber:f/5.6
File Source:Digital Still Camera
Flash:No Flash
Focal length:34 mm
ISO:400
Model:NIKON D3400
Software:Adobe Photoshop Elements 2.0
White Balance:0
URL:https://trad-lighting.net/gallery/displayimage.php?pid=103
Favourites:Add to Favourites

Comment 1 to 3 of 3
Page: 1

Sammi   [Fri 26 Jul 2024 at 17:53]
That's lucky.!
Max   [Sat 14 Dec 2024 at 19:51]
That's interesting that the fill pressure is so low as to enable a discharge across the break. I thoughts the internal pressure was closer to atmospheric conditions.
Tuopeek   [Sat 14 Dec 2024 at 20:31]
Just checked that out and definitely low pressure fill but may be air. I'll put a picture up.

Comment 1 to 3 of 3
Page: 1