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Failed and Failing MH Bulbs

Failed and Failing MH Bulbs

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A couple weeks ago, I was waiting to catch a train at Sandy Springs station. I spotted failed and failing MH bulb at the high ceiling. The one on the right is barely glowing as shown at the picture. Seems that these bulbs were burning 24/7/365 without turning off.

1102180958.jpg 1003180928.jpg 1002181028.jpg 0730181437.jpg

Light Information

Light Information

Lamp
Lamp Type:Metal Halide
Base:Single-contact (Mogul- in America) Goliath Edison Screw (E39)
Shape/Finish:BT37
Fixture
Location:Sandy Springs MARTA Station, Sandy Springs, GA, USA
Electrical
Wattage:400 Watts

File information

File information

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Filename:1002181028.jpg
Album name:rjluna2 / Sighted Lamps
Keywords:Lamps
File Size:179 KB
Date added:Oct 15, 2018
Dimensions:1600 x 1200 pixels
Displayed:89 times
DateTime Original:2018:10:02 14:28:38
Exposure Bias:0 EV
Exposure Time:2800000/24000000 sec
FNumber:f 2.9
Flash:No Flash
Focal length:3.55 mm
ISO:Auto
Make:LG Electronics
Model:LG-VN280
Software:Q6695A-SCAUUSZ-3.1.340128T
White Balance:0
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Comments
lightinglover8902
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Oct 15, 2018 at 08:41 PM Author: lightinglover8902
If its on 24/7/365, then the ballasts are probably gonna be noisy, due to heat, which rattles the iron core.

dor123
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Oct 16, 2018 at 06:47 AM Author: dor123
Operating them 24/7/365, shouldn't damage their ballast more than usual. The only reason why quartz MH lamps aren't suitable for 24/7 operations, is the risk of explosion.
For applications where the lighting should operate 24/7 (Tunnel lighting and similar), HPS lamps, fluorescent lamps and LPS lamps are most suitable.

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 hope that LED won't replace all forms of other light

streetlight98
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Oct 17, 2018 at 08:01 PM Author: streetlight98
Yeah a ballast is basically the same thing as a transformer, and transformers run 24/7 without issue. They do get louder over time, and loose bolts and a delaminating core don't help.

To resist is to piss in the wind, anyone who does will end up smelling.

dor123
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Oct 17, 2018 at 08:16 PM Author: dor123
They are looking similar, but not the same device. Transformer is a voltage source, while a ballast is a current source.

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 hope that LED won't replace all forms of other light

joseph_125
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Oct 17, 2018 at 08:36 PM Author: joseph_125
You do know that most ballasts here are technically current limited transformers? The only exceptions are things like single voltage ballasts for certain lamps like 120v low watt HPS, some 240/277v ballasts. If they're burning 24/7/365 I anticipate the lamp or the capacitor going before the actual ballast. Most lamp manufacturers recommend that MH lamps burned 24/7/365 be shut off every 2 weeks for 15-20mins. The idea is that the lamp will fail to start instead of going until it explodes.
dor123
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Oct 18, 2018 at 02:56 AM Author: dor123
I think that the recommendations for turning of every week or two, is to reduce the likely of explosion.

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 hope that LED won't replace all forms of other light

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