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Philips F32T8 70CRI 3500K

Philips F32T8 70CRI 3500K

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I like this lamp because of the purple endbanding. These older Holland made Philips T8s seemed to develop the purple endbanding as they became well used. Found at a school remodel in a trashcan full of random lamps.

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Filename:IMAG0273.jpg
Album name:j-frog / Fluorescent
Keywords:Lamps
File Size:167 KB
Date added:Mar 06, 2012
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jercar954
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Mar 06, 2012 at 07:19 PM Author: jercar954
Westy CWX lamps were also famous for purple end banding. Nice find!

Preheat and T-12 fluorescents forever! Down with LED's and instant start T-8 fluorescents.

don93s
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Mar 06, 2012 at 08:34 PM Author: don93s
I've noticed that some Vita-Lites also make purple end banding. I have some Dura-lite F20's that have that. I wish all F32's did more of this, lol.
J-Frog
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Mar 06, 2012 at 10:32 PM Author: J-Frog
Same here, its cool looking. Btw I have two heavily used Westy CWX lamps with no endbanding whatsoever.

Jeremiah The Bullfrog

dor123
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Mar 07, 2012 at 01:48 AM Author: dor123
Never seen end banding on T8s.

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.

TL8W
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Mar 07, 2012 at 07:52 AM Author: TL8W
These TL735s have a hybrid Triphosphor/halophosphate coating. Red or purple banding is due to the triphosphor element in the lamp. Banding is supported by argon buffering rather than krypton - are these 32w lamps argon filled by any chance. F30T8 and F15T8 are also argon-buffered whilst (in Europe/UK as far as I know) 18W, 36W, 58W and 70W tubes are krypton-filled. Such lamps have a slightly different burning profile at the electrodes that makes banding rare.

We do not have to agree on anything to be kind to one another. The ability to be civil is available to everyone on earth, for free.

dor123
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Mar 07, 2012 at 08:47 AM Author: dor123
TL8W: R U Sure that the american energy saver F32T8 DON'T contains krypton AT ALL, but the same gas as the T12s (Pure argon)!?!?!?!?
So for what they were invented? Are they really saves energy over F40T12s, like the 36W T8 does?
I bet that if this is the case, they are dimmer than the F40T12s, even if they would have a full mercury dose, so yield no saving.
So they aren't differnet than the T8s of 15W, 20W, 30W and 50W in any way.
I already raised this hypothesis about the american "Energy saver T8s" even before, because of their exceptional and unusual ability to strike on rapidstarts (A thing that isn't a reality with such a high starting voltage of the krypton T8s), as there is NO WAY to make a rapidstart ballast with such a high OCV, to ignite a krypton buffered fluorescent lamps (It will be heavy, complicated and large and very expensive and will have huge losses). Fluorescent lamps with krypton can only operated by a switchstart/preheat ballast with a starter, or by an electronic ballast (Instant start, PTC or programmed start [HV simulated rapidstart can also ignite krypton buffered lamps, but this is a rare type of ignition mothed]).
Also, regarding to the phosphors of this lamp: I think that i have seen 8W T5 lamps that have a combinations of triphosphors and halophosphors in EXIT signs in "Machsanei Lahav" supermarket.
Also i think that i saw CFLs with this phosphor combination as well.
Also, is end banding can occurs only in fluorescent lamps with pure argon buffering? If so, why this isn't happens with the new long T5, which have pure argon as well?

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.

don93s
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Mar 07, 2012 at 11:37 AM Author: don93s
@dor123, Doesn't krypton lower the operating voltage? The 32w T8 actually has a HIGHER operating voltage than 34w T12, 36w T8 or 40w T12. Though 32w will start on a magnetic rapid start, they tend to flicker excessively on a HPF ballast because of the lamp voltage exceeding what the ballast/capacitor combination is designed for.

I think the only reason they "save" energy is because they are designed for a lower current (265ma) and the tri-phosphors are supposed to make up for some of that in increased output.
dor123
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Mar 19, 2012 at 02:00 AM Author: dor123
don: Krypton indeed have a lower operation voltage, but it also have a higher starting voltage, and this is why the european T8, which have krypton, can't be started by a rapidstart.
Also, the T8 diameter, have also its effect on the starting voltage.
TL8W said, that the end banding on the F32T8 pictured here, is supported by an argon buffering, rather than krypton buffering. End bandings on krypton buffered lamps is indeed not normal.
And indeed, this lamp pictured here, is the first T8 that i have seen in my life with an end banding.

Update: 19.3.2012, James Hooker verified with his lighting company(?), that the american F32T8s filled with pure argon, as they fills their F32T8s for export to the US with argon only.

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.

don93s
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Mar 19, 2012 at 11:18 AM Author: don93s
@dor123, very interesting. BTW, I have seen GE 34wT12 lamps with end banding. It's somewhat rare, but they indeed do sometimes. More commonly, the older 35w GE's almost always had heavy end banding and I believe those had krypton too. As for 32w. I recall one installation with 5000k F32T8's with some weird brand used to light a gas station/store and every one of them produced heavy end banding. Other than that, I never see them do that. I tend to think a big factor is the electrode emitter and not just the fill gas.
dor123
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Mar 19, 2012 at 11:40 AM Author: dor123
Usually the european krypton energy saver T8s, don't produces end banding at all. I think that there is a rule for the buffer gas in the formation of the end banding. Usually, end banding appears only in old formats of fluorescent lamps (Miniature T5, T12, classic T8, circular T9).
Long HF T5s, also usually don't produces end banding, but in this case, i don't know why, as they uses argon only as well.
The F34T12s are probably argon-krypton with an electric conductive coating inside, as this is the reason for their lower current and output and wattage.

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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