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The Switch on my F4T5 Lampi fluorescent Fixture

The Switch on my F4T5 Lampi fluorescent Fixture

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now THIS is a strange animal here. It was advertized in having an electronic ballast. This thing has like a program start. very similar to a pulse starter EFS120, however if you leave an EOL lamp it keeps preheating the cathodes endlessly. ALSO the ballast hums very loudly and still flickers at the same rate of a classic choke. It behaves EXACTLY like a magnetic ballast however the fixture is VERY light. Also it seems to underdrive the lamp as it is MUCH dimmer than my MS104. If anybody can tell me about how this works I'd love to know as I have never seen anything like this in my life...

DSC03008.JPG Progress_Switch_and_outlet.jpg Lampi_F4T5_switch.jpg DSC01709.jpg

Light Information

Light Information

Manufacturer:Lampi
Model Reference:F4T5
Lamp
Lamp Type:F4T5
Fixture
Fixture Type:Fluorescent
Ballast Type:Some strange electronic ballast that behaves the same as a magnetic
Location:behind my television set.
Electrical
Wattage:4
Current:120
Optical
Color Temperature:4100k
Physical/Production
Dimensions:8 inches appx
Factory Location:Alabama USA
Fabrication Date:June 18 1998
Application/Use:General Lighting

File information

File information

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Filename:Lampi_F4T5_switch.jpg
Album name:dieselducy / Switches
Keywords:Lanterns
File Size:272 KB
Date added:Dec 07, 2012
Dimensions:2050 x 1537 pixels
Displayed:138 times
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dor123
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Dec 08, 2012 at 01:53 AM Author: dor123
We need a video to see the fixture behavior.

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.

Danny
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Dec 08, 2012 at 03:46 AM Author: Danny
I have one of these diesel. I think i have a picture of it on here, mine is branded "Ring" and is very light and too acts like Magnetic with the cathode flicker! EOL Lamps flicker in these like they do on 8w preheat / switchstart if you remove the starter... very strange!... Mine started smoking though when i left an EOL Lamp in but still working though lol SEE HERE for mine... Mine is a 240V version
Ash
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Dec 08, 2012 at 03:52 AM Author: Ash
Maybe capacitor-less electronic ballast ? Ie one that makes a pulse or series of pulses to he lamp only when the momentary voltage on the line is above some threshold, and stays off when the line voltage is low

I'd like to see the insides
Proteus
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Dec 08, 2012 at 01:31 PM Author: Proteus
I had one of these in the past, but unfortunately I don't know where it is gone... But I know that I opened it and there is an electronic ballast inside.

Btw. I made some years in the past a resistor ballast on my own for F4T5 lamps for 48V line voltage, it worked perfectly. This should be in one of many cardboard boxes in my storage This worked with manual preheat (like push-hold-release)
jercar954
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Dec 08, 2012 at 02:51 PM Author: jercar954
I had one similar but it plugged directly into the wall outlet. It had an Osram F4T5/WW lamp made in Italy. It went 24/7 for one month shy of five years before going EOL. I bought another one that had a Philips F4T5/WW made in Japan. That one went 24/7 for FIVE WEEKS before going EOL.

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

BG101
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Brian TheTellyman
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Dec 08, 2012 at 03:49 PM Author: BG101
It would be interesting to test both fittings with known good tubes to see how the newer one compares. Maybe they have used a cheaper ballast design or it could have been a duff tube?


BG

Say NO to DICTATORSHIP in the form of bulb/tube/ballast bans !!

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Dec 08, 2012 at 05:10 PM Author: jercar954
I've never had good luck with Asian made lamps. Lamps made in the U.S. and Europe seem to be much higher quality.

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

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jonathon.graves johng917 GeorgiaJohn
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Dec 08, 2012 at 10:56 PM Author: DieselNut
I have a pair similar to these and sixteen of the type that plug straight into the receptacle. They look more like yours but have a "non replaceable" tube. They act like program start too. I need to open one up if I can do it without destroying it. May be worth sacrificing one to test with a EOL tube to see if it smokes like Danny's!

Preheat Fluorescents forever!
I love diesel engines, rural/farm life and vintage lighting!





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Dec 08, 2012 at 11:38 PM Author:
From the look of the end blackening of the tube I'd guess it's not magnetic ballast. It is electronic ballast but uses capacitor and resistors to limit the current to the tube. It may also contain a diode across the tube to give the tube lower starting voltage as it preheats the tube continuously so you will get the blackening that you see on one side of the tube due to overheating of the electrodes. The tube lights when the diode is not conductin on the reverse polarity of the AC supply and preheats the tube again when it conducts.
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