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Philips HPL-N 125W from globe

Philips HPL-N 125W from globe

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It came in my Steinitz Globe, and seems to be original

It works, but is a bit unstable - the brightness is vibrating and changing slightly all the time. The resistor is of the old style "stick"

Date code [|]F9

mitsushi.jpg pl_11.jpg mv_14.jpg mv_12.jpg

Light Information

Light Information

Manufacturer:Philips
Model Reference:HPL-N
Lamp
Lamp Type:Mercury
Base:E27
Shape/Finish:Elliptical
Fixture
Ballast Type:Inductor
Electrical
Wattage:125W
Current:1.15A
Physical/Production
Dimensions:LxD 170x75mm
Factory Location:Belgium

File information

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Filename:mv_14.jpg
Album name:Ash / Lamps
Keywords:Lanterns
File Size:282 KB
Date added:Sep 06, 2011
Dimensions:1366 x 767 pixels
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Sep 07, 2011 at 10:36 AM Author:
LOL..stick. The new MVs are very shoddy they use a 'resistor' looking resistor and just tac weld the two leads in place no allowance for thermal expansion whereas the old one uses the copper wrap around the 'stick'so the copper being flexible expands without stressing the welding. I think you meant stroboscopic flicker when you said vibrating? It's normal for MVs even new ones to flicker intermittently it's caused by the arc root moving about on the electrode rim instead of sitting on the electrode tips.
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Sep 07, 2011 at 01:33 PM Author: Ash
I have 2 newer lamps dating to around 2000 and what i believe is around 2006, both of them have the film ("resistor") resistor

There is a small 125W installation in clear globes not far from where i live, that was instaled around 2000. It still works today like new, all lamps i think are original, and there is no problem with th new style of resistor

Now the reisitor is not too hot when working since it is only for starting and at very low current. Now what about the ARC TUBE being welded to the hard frame without any strip to dampen its expansion, as i see in all 3 "standard" 125W mercury lamps i have ?



It is a bit of "rectifying" flicker, and a bit of brightness dropping momentary and slightly changing brighter / dimmer

A bit like if there is arcing connection somewhere, but there is none - it is specific to the lamp itself




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Sep 08, 2011 at 12:17 AM Author:
It's normal probably due to your supply voltage fluctuating, sometimes the arc can go out when it flickers too much can be quite unexpected like a blackout cause it happened when I used it in my room and it was the only light used.. . So I shifted the light to very near the incoming circuit breaker and it flickers much less and does not go out.
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Sep 08, 2011 at 12:22 AM Author: Ash
This is specific to the lamp. This lamp does it in all fixtures, other 2 identical (newer) lamps i have dont do it at all

It also increases when i change the burning position when the lamp is working (like detach the globe from the pole and turn it in my hands)




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Sep 08, 2011 at 12:29 AM Author:
It may be the arc being unstable caused by one side of the electrode not conducting properly like you said rectifying and moving the burning position causes the arc to 'jiggle' and so it flickers more because the arc root moved and has to find the hotspot again..if that is true it will damage your ballast since it is converting AC to DC.
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Sep 08, 2011 at 12:43 AM Author: Ash
This looks like the original lamp from that fixture. The fixture is from 91, the lamp uses the old style resistor so i think it is from back then. The place where the fixture was installed is from the late 80s (building finished in early 90s), and the globe on the fixture is quite worn out, so i assume that it was put to work in 91 or shortly after

The fixture was taken down in the 2000s

The ballast is still intact (after assumed >10 yearas of working with this lamp) and does not get too hot when working, so i think it is ok




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Sep 08, 2011 at 12:57 AM Author:
It's nice to see MVs last that long and not go out the China ones go out within 2 years of 12 Hr use sometimes even less and one even exploded in a transparent globe and quite a few had their outer bulb detached from the base being an upside down globe fixture leaving the arctube exposed.
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Sep 08, 2011 at 05:05 AM Author: Ash
And this lamp has excellent light output - not far from a NOS lamp

Mercury is long lasting and efficient when built well
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