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1.5W fluorescent night light lamp running on incandescent ballast

1.5W fluorescent night light lamp running on incandescent ballast

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Success! This is the lamp from this night light running on an incandescent ballast. The ballast in question is a 7.5 watt indicator lamp, which powers the fluorescent lamp with 1.25 watts. The arc voltage of the fluorescent lamp is 25 volts. I've been running it like this for a few hours, and it works beautifully.

While this indeed works, there is one bug. The the power allowed by the ballast isn't nearly enough for preheating. The cathodes don't glow at all, and the lamp never starts. To start it reliably, I have to have a 25 watt incandescent lamp in parallel with the 7.5 watt lamp during preheating, which I then remove once the lamp starts. I'm wondering if there's a way I could wire it up so that the 25 watt lamp serves as the ballast during preheating, but then the 7.5 watt lamp takes over once the lamp starts. I've asked for help in the forums here.

IMG_0938.JPG IMG_1018[1].JPG IMG_0784.JPG IMG_0639~0.JPG

Light Information

Light Information

Lamp
Lamp Type:Fluorescent night light lamp
Fixture
Ballast Type:7.5 watt incandescent lamp
Electrical
Wattage:1.5
Voltage:120V

File information

File information

Download: Download this File
Filename:IMG_0784.JPG
Album name:themaritimegirl / Experiments, Projects, & Mods
Keywords:Lamps
File Size:199 KB
Date added:Mar 22, 2014
Dimensions:2050 x 1448 pixels
Displayed:212 times
URL:https://www.lighting-gallery.net/gallery/displayimage.php?pos=-92055
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rjluna2
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Robert


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Mar 22, 2014 at 06:41 PM Author: rjluna2
Nice experiment, TheMaritimeMan

Pretty, please no more Chinese failure.

Proteus
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Mar 22, 2014 at 07:30 PM Author: Proteus
Nice, indeed!

I have the same lamp and am wondering about the middle feedthrough there... What about it's purpose?
streetlight98
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Mike McCann


GoL Mike McCann 88219189@N04/albums
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Mar 22, 2014 at 07:42 PM Author: streetlight98
cool! that lamp looks like a phosphored Mv arc tube lol.

Please check out my newly-updated website! McCann Lighting Company is where my street light collection is displayed in detail.

ace100w120v
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Mar 22, 2014 at 10:29 PM Author: ace100w120v
Interesting!
themaritimegirl
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Florence


themaritimegirl themaritimegirl themaritimegirl
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Mar 24, 2014 at 01:40 PM Author: themaritimegirl
Ah! Once again I wasn't alerted to any comments being posted here. Thanks everyone!

Proteus: The middle wire goes to a starting probe, this lamp's intended method of ignition (hence the problems I'm having with a preheat ignition).

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BG101
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EYE H80 Mercury Vapour


Brian TheTellyman
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Mar 28, 2014 at 12:41 PM Author: BG101
Does the 7.5W ballast lamp light up brighter or dimmer during attempted preheating? I wonder if an inductive choke will work better.


BG

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

themaritimegirl
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Florence


themaritimegirl themaritimegirl themaritimegirl
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Mar 28, 2014 at 06:59 PM Author: themaritimegirl
I don't actually remember. It might have been dimmer. I never thought to try an actual ballast; I'll do that next time I'm home. A magnetic ballast might be the solution to running this lamp reliably in a preheat system. I'd just need to find a ballast that could remain acceptably cool while running (since the lamp has a slightly lower arc voltage than an F4T5), and I'd had to put a capacitor in series to dramatically lower current.

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