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Sylvania 2xF28T5 Ballast - QTP2x28T5/UNV PS95-SC

Sylvania 2xF28T5 Ballast - QTP2x28T5/UNV PS95-SC

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A Sylvania 'QuickTronic' 2-lamp F28T5 programmed-start ballast.
Has EOL protection, if one lamp goes out or is removed, they both shut off.

Says 'minimum start temp 50F' .. I happen to know that it'll start at temps allot lower than that, like -19F LOL :)

Oh and...it will run F40T12 lamps...at about 20w as well LOL

_U2X28.jpg _U-2X54.jpg _S-2X28.jpg _G-1X40.jpg

Light Information

Light Information

Manufacturer:Osram Sylvania
Model Reference:QTP2x28T5/UNV PS95-SC
Lamp
Lamp Type:Linear Fluorescent
Base:Mini Bi-Pin
Shape/Finish:T5
Service Life:-unknown-
Fixture
Ballast Type:Electronic Programmed Start
Socket Type:Mini Bi-Pin
Electrical
Wattage:2x 28
Voltage:120/277v (input) 600 (output)
Current:.5a
Physical/Production
Dimensions:9.5x1.75x1.25
Factory Location:China
Fabrication Date:-unknown-
Application/Use:General Lighting

File information

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Filename:_S-2X28.jpg
Album name:xmaslightguy / Fluorescent Ballasts - Electronic Rapid & Programmed Start
Keywords:Gear
File Size:105 KB
Date added:May 14, 2011
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Comments
Kev
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May 15, 2011 at 04:26 AM Author: Kev
Personally i have found that the osram ballasts are better, But the ones we have over here are german made, I notice yours is china? Put it in a weather proof fitting in a shop in hot conditions and see how long it lasts??

Voted to leave the EU and proud! 👉🏻🇪🇺🇬🇧

Medved
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May 15, 2011 at 04:56 AM Author: Medved
According to the wiring diagram, it is series, current mode heated connection: The inverter hot output is on one of the red wires, neutral return is one of the blue wires, between the remaining red and one yellow is the resonant capacitors (or capacitors and preheating PTC - per OSRAM's "standard" circuit) for one lamp, between remaining blue and yellow the same for the other lamp.

That mean it should be able to run even single ~200..300V arc lamps, like F35T5HE, F49T5HO (this at BF ~0.7),...
Tube is then connected between red and blue, yellow are shorted together (both resonant capacitors are then in series).

No more selfballasted c***

xmaslightguy
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^homebuilt fixture


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May 15, 2011 at 10:04 AM Author: xmaslightguy
@kevxsi16v:
LOL I could just put it in my bedroom in a standard enclosed fixture with no fan on it for the summer where daytime temps will be above 90f LOL that'd probably finish it just as quick
I also have a Sylvania 54w T5 ballast, which was made in Germany .. has a totally different design than this one (hopefully those are at least somewhat decent quality)

@Medved
Interesting that they would run the lamps in series...I might have to take this and a 5' or 6' T12 lamp outside to the patio for 'testing' LOL (I've never seen T5's in anything longer than 4' here)

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

Medved
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May 16, 2011 at 04:19 PM Author: Medved
@xmaslightguy: It would run even T8 and T12, the only limitation is the arc voltage (should not be higher then the specified lamp combination to avoid power overload and/or false EOL protection trip) and nominal current (should be in the range 0.8..1.5 x the nominal current of the specified lamp to avoid insufficient electrode temperature)

The series connection is the cheapest and easiest for power sharing: It require only one ballasting choke and both run simply on equal arc current and generally form only one, single resonant circuit (what allow the use of e.g. frequency feedback loop eliminating the influence of power component tolerances - so eliminate one more restriction for component selection, what allow e.g. use of less accurate, but more robust types).
Series connection can not be used only, when the total arc voltage of series combination would exceed ~50% of the DC bus voltage, so only then are used multiple parallel branches.
Power factor corrected front-end (rectifier,...) can generate the DC bus only higher then peak of the maximum input voltage (the PF corrector is in fact boost DCDC, what's purpose is to shape consumed current to get low THD and stabilize the DC bus voltage to allow wide mains voltage operation), what mean >400V (so i would expect ~410..430V).
So for max 277V AC mains it mean, then such ballast would be technically able to easily supply any series lamp combination up to ~200V.

And when the circuit is of the selfoscillating type with current mode heating, it feature intrinsic "lamp removal" shut-down: Disconnecting any lamp in fact break the feedback loop, so the inverter stop oscillating and it would not restart, when all filament do not complete the circuit again...

No more selfballasted c***

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