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Unbelievable - SoX18 ballast runs F40T12 fine??

Unbelievable - SoX18 ballast runs F40T12 fine??

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So i got the sudden idea to try this with my sox18 gold eye ballast and it works (seemingly) perfect. I flicked the switch on and lamp lit dimly and was rectifying the same way as it does on RS since its EOL. A plasma ball makes it start up and it runs fine on its own.

Used an EOL tube, i didnt want to risk hurting a good lamp. I cant believe it works and this ballast isnt getting hot as fast like it does with SOX18 lamps.

Running volts across lamp is 115.7v
Kill a watt says 50w , 0.99a and 0.41pf
Lamp was about as bright as would be on one of those typical small can NPF ballasts


I was going to wire this up as preheat with a starter but felt i could risk blowing the electrodes off in a good lamp so I just stuck with no electrode heating or starting. Im sure if wired with preheat it would have performed very similar to a real fluorescent ballast

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Album name:Lightingguy1994 / Lamp comparisons, ballast fun & Experiments
Keywords:Lamps
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Date added:Aug 25, 2019
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Date Time:2019:08:25 22:37:19
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Medved
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Aug 26, 2019 at 01:52 AM Author: Medved
Wiring it with a starter wont risk any lamp for short time. For long time the problem could be, the LPS ballast does not deliver enough current into short circuit load (what the setup effectively is during preheat) to provide sufficient electrode preheat, so the lamp will start with colder electrodes than intended. Consequence is the expected shorter lamp cycle life (i.e. more startup wear due to cold electrode sputtering). But definitely less wear than completely cold starting the lamp...

No more selfballasted c***

Lightingguy1994
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Aug 27, 2019 at 09:29 AM Author: Lightingguy1994
I did end up wiring a starter but kept this EOL tube and it still preheated and started anyway rather unpleasantly. No good bulbs were used for this test
Lightingguy1994
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Sep 13, 2019 at 09:42 PM Author: Lightingguy1994
I am thinking of trying 40w MV on this.
ResR
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Martin Lelle resr1286
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Sep 14, 2019 at 04:22 AM Author: ResR
It might work well. I used 2 36W fl. tube ballasts in parallel to drive 70W HPS with internal starter.

http://www.lighting-gallery.net/gallery/index.php?cat=11837

Lightingguy1994
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Sep 18, 2019 at 06:35 PM Author: Lightingguy1994
The mercury lamp did not warm up much, current must be to low. In all these tests ive done the ballast never even got warm. SoX18 makes it get hot in minutes
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GoL
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Sep 18, 2019 at 07:52 PM Author: joseph_125
Yeah I have the same ballast but NOS and it still runs hot with a SOX 18 lamp. I wonder if the ballast is just a modified fluorescent ballast. The core looks the same as one from a rapid start ballast.

As far as I know no one else makes a SOX 18 ballast in the same form factor.
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