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Preheat Ballast

Preheat Ballast

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Keystone 14, 15 and 20 Watt Ballast.

17811133-77D7-492E-BC4F-87B4AB72D430.jpeg IMG_0793.JPG IMG_0791.JPG IMG_0785.JPG

Light Information

Light Information

Manufacturer:Keystone
Model Reference:UC123C
Lamp
Lamp Type:15 - 20 Watt
Fixture
Ballast Type:Pre Heat Reactor ballast
Electrical
Wattage:15 - 20 Watt
Current:0.27 Amps

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Filename:17811133-77D7-492E-BC4F-87B4AB72D430.jpeg
Album name:ultralume / Surplus Store Find
Keywords:Gear
File Size:476 KB
Date added:Nov 13, 2017
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Date Time:2017:11:13 21:42:05
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ultralume
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Nov 13, 2017 at 10:05 PM Author: ultralume
Does anyone know why this ballast is rated at 270 mA? Most 14, 15, 20 Watt choke ballasts that I have seen are rated at 360 mA. The 270 mA ballast has 29 Ohms coil resistance while a 360 has 22 Ohms. Clearly there is a difference. I removed the 270 mA Reactor from a F14T12 table lamp. The lamp took a while to preheat and difficult to start. The cathodes did not glow with this ballast. I replaced it with a 360 mA ballast. Now the ends glow normally during preheating and lamps start right away. Apparently the 360 mA ballast use the correct one for this application
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Nov 13, 2017 at 10:26 PM Author: nicksfans
270 mA is very low for the lamps this is supposed to run. I'm not sure what the thinking was there. This might work well for running F17T8s, though, as those are designed for 265 mA and have 4.5V cathodes.

I like my lamps thick, my ballasts heavy, and my fixtures tough.

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sol
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Nov 14, 2017 at 03:28 PM Author: sol
Maybe an early attempt to make an energy saving ballast ?
ultralume
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Nov 14, 2017 at 07:31 PM Author: ultralume
My only guess is that this ballast was optimized for T8 lamps. An F14T8 preheats and lights normally. T12 bulbs need more current.
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Nov 14, 2017 at 07:43 PM Author: sol
Makes sense. How does it work with F15T8 ?
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Nov 15, 2017 at 01:58 PM Author: ultralume
Yes, F15T8 lamps work well on this ballast. The ends glow normally during preheating and lamp brightness appears normal. I tried it this morning.
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Nov 15, 2017 at 07:08 PM Author: sol
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