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All these 6 28W T5 lamps have glowing filaments. Why?

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Album name:dor123 / Light bulbs (Lamps)
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Date added:Feb 03, 2019
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Date Time:2019:02:03 14:04:13
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Feb 03, 2019 at 06:29 AM Author: High Intensity
If all of the lamps cathodes are glowing, then it might be a defective programed start ballast (i had a similar thing happen to a jamicon ballast before it failed).

Old lighting is, and will always be, the best lighting.

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Feb 03, 2019 at 11:16 AM Author: xmaslightguy
Looks like individual fixtures, rather than a single unit? Correct?
So individual 2-lamp ballasts, kinda doubt all are bad...I see 3 possibilities:
* Somebody put 28w lamps in 54w fixtures.
* These are a rapid-start type ballast that doesn't cut off filament heating like program-start would.
* These are dimmable ballasts, and running at something less than full brightness.

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

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Feb 03, 2019 at 11:44 AM Author: dor123
The ballasts are all electronic, so rapid-start isn't relevant here, since it is a magnetic ballast topology. I don't know if these battens are tandem or have separate three 2x28W T5 ballasts.

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.

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Feb 10, 2019 at 08:00 AM Author: dor123

Looks like individual fixtures, rather than a single unit? Correct?
So individual 2-lamp ballasts, kinda doubt all are bad...I see 3 possibilities:
* Somebody put 28w lamps in 54w fixtures.
* These are a rapid-start type ballast that doesn't cut off filament heating like program-start would.
* These are dimmable ballasts, and running at something less than full brightness.

Update: Your first possibility is the correct one, as I've analyzed the brightness of these 28W T5 lamps, and seen these lamps much brighter than the ones at the Sealights in the storage of Carmel hospital, which have Philips HF-E 228 TL5 II for 2x28W T5 lamps, and are essentially equivalent to 54W T5 HO lamps in brightness, which is indeed means that there is a mismatch between the lamps (28W T5) and the ballasts (Three 2x54W T5 HO). I told this to the maintenance person, and he didn't believed me that these are 28W T5 lamps that operating on 54W T5 HO ballasts, even after I've said him that the etch of the lamps reads 28W.
Sorry that I didn't captured these battens from far to give you the impression.
I think the ballasts aren't programmed start, but just CFL like ones, since they don't activates any EOL protection, and lets the lamps to burn with overheated cathodes and overdriven. Also: There are programmed start electronic ballasts that can detect if the lamp is 28W or 54W T5 lamps, and optimize the lamp electrical characteristics for each lamp.

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.

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Feb 10, 2019 at 06:36 PM Author: xmaslightguy
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Update: Your first possibility is the correct one,

I'm not surprised that turned out to be the case. The 54w & 28w lamps (and there respective fittings) all look exactly the same, so unless you actually read the lamp etch, its an easy mistake to make.

I've never seen a ballast that can detect if the lamps are 28w or 54w. And whenever I've tried it on my own lights, the 54w ballasts I have simply overdrive 28w lamps as if they were 54w (in this case they were programmed start.. I never bothered trying anything other than 54w on the instant-start ones). Didn't leave it on very long - just long enough for the lamps to become full warmed up. I'm not sure if there's much difference in the lamps themselves ... other than the filaments, the ones on 28w are definitely different (lower wattage) than the 54w

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

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Feb 11, 2019 at 12:22 AM Author: dor123
Programmed start ballasts usually triggers an EOL protection, when operating 28W T5 on 54W T5 ballast and the opposite. That why I think these battens have CFL like ballasts.

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.

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Feb 11, 2019 at 06:02 PM Author: xmaslightguy
@dor123:
Could be the Programmed Start ballasts you guys have are different than the ones here, but have you actually tried it?
I have tested doing so on a few different ballasts (all programmed start), and didn't trip the EOL protection on any of them.

On one ballast (a 2xF54) I also checked it with a 'kill-a-watt' meter, and power taken is very close... .98a with 28w lamps, 1.02a with 54w

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

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Feb 12, 2019 at 04:36 AM Author: dor123
Most American programmed start ballasts, don't have EOL protections at all. Here all programmed start electronic ballasts have this. I would except that the if the ballast have one, so it would trip it in the case of the lamp mismatch (28W on 54W and the opposite).
Accoding to Philips website, their equivalent Essential 28W and 54W T5 lamps, have 0.170A (28W) and 0.460A (54W) respectively.

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.

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Feb 12, 2019 at 08:25 AM Author: dor123
Wide field picture of these battens, showing their immense brightness for Osram Smartlux 28W/865 HE T5 lamps:

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.

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Feb 12, 2019 at 06:05 PM Author: xmaslightguy
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Most American programmed start ballasts, don't have EOL protections at all.

Every one of the F54 ballasts I tested on does have EOL protection.

I'm not sure where you got this info, from...it is correct for Instant Start (most of those do not have EOL protection (there are a few that do))
But I don't think its correct for programmed-start - I believe most of those do have it (and from my own experiance shows that to be the case)

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

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Feb 12, 2019 at 10:25 PM Author: HU112
According to my experience, programmed-start electronic ballasts won’t trigger EOL protection when driving lower wattage lamps than they are rated for, say, a 18W T8 on a 58W T8 ballast.
If it is reversed (low wattage ballast driving high wattage lamps), the ballast senses the abnormality and triggers the EOL protection.

No more cheapy crappy Chinese junk, please.

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Feb 12, 2019 at 10:59 PM Author: xmaslightguy
@HU112:
That makes sense. The 58w lamp is quite a bit longer than an 18w. Attempting to run that would overdrive the ballast...


I did try a pair of 54w T5's on a 28w ballast, and that worked just fine (but they are the same length, so I don't think it 'sees' them as much different than the proper lamps)

I'm gonna have to try lamps too long on a ballast sometime & see if it triggers the EOL protection like you got.

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

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Feb 13, 2019 at 10:50 PM Author: suzukir122
I'm wondering what this means when this happens as well.
Another user on here, Alights, also saw the same thing as well. https://www.lighting-gallery.net/gallery/displayimage.php?album=2784&pos=119&pid=100047

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Feb 14, 2019 at 12:27 AM Author: dor123
Programmed start electronic ballasts have additional protections beside the EOL one, like overheat protection which prevents it from overheating in the case of lamp mismatch or insufficient cooling in the fixture.

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.

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