Milwaukeeman2003
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| Hello everyone, I’m just wondering what type of ballast can be used for a 20W, 15V ND20 lamp. Any information will be greatly appreciated! Thanks!
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Screw the 2028 120 lumen per watt mandate and DeviantArt! Love old cars, cassette tapes, radios, severe weather and most of all, lighting!
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RRK
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| In 230V part of the world, I used 80W fluorescent choke to light DNAS18 lamps. Chinese looks to have about the same requirements (15V, 1-1.3A). For US, probably some HX autotransformer for 75-100W mercury lamp, checked with an ampermeter to have required current at short circuit of the output and 200+ V open circuit voltage.
The lamp sure will light up also on some high power HF electronic ballast like Fulham Workhorse, but I don't know the specifics.
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« Last Edit: December 17, 2024, 11:32:24 PM by RRK »
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RRK
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Roman
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| Another idea to try - two identical instant-start (one wire per tube end) F40T12 US magnetic lag ballasts running in parallel. In our 230V world that will be equivalent to running two 40W chokes in parallel, which is close to 80W choke impedance.
Ballasts will run hot, so don't put them in a tight box.
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« Last Edit: December 18, 2024, 02:11:47 AM by RRK »
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WorldwideHIDCollectorUSA
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HID, LPS, and preheat fluorescents forever!!!!!!
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In 230V part of the world, I used 80W fluorescent choke to light DNAS18 lamps. Chinese looks to have about the same requirements (15V, 1-1.3A). For US, probably some HX autotransformer for 75-100W mercury lamp, checked with an ampermeter to have required current at short circuit of the output and 200+ V open circuit voltage.
The lamp sure will light up also on some high power HF electronic ballast like Fulham Workhorse, but I don't know the specifics.
How were you able to light those low pressure sodium lamps using an 80W preheat fluorescent ballast? Did you use a fluorescent starter to assist with ignition? |
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Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.
DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.
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RRK
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Roman
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| Soviet ones (DNaS18) are 3-electrode and start right from 230V voltage. So only a choke with a suitable impedance is needed. As far as I read Aliexpress users comments, Chinese lamps seems to behave the same way.
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WorldwideHIDCollectorUSA
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HID, LPS, and preheat fluorescents forever!!!!!!
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| In that case, it would have a probe start topology?
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Desire to collect various light bulbs (especially HID), control gear, and fixtures from around the world.
DISCLAIMER: THE EXPERIMENTS THAT I CONDUCT INVOLVING UNUSUAL LAMP/BALLAST COMBINATIONS SHOULD NOT BE ATTEMPTED UNLESS YOU HAVE THE PROPER KNOWLEDGE. I AM NOT RESPONSIBLE FOR ANY INJURIES.
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RRK
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| Both Soviet and Chinese lamps are probe start with a resistor visible. Actually, Chinese quality is getting so low they are putting off-the-shelf lacquered resistor in outer bulb.
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Laurens
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| Can't really tell the power but my GP20na seems to have a 1 or 2w carbom film (grey, matte) starting resistor.
If it ever burns out, you could still ignite the lamp with a HV impulse.
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