Author Topic: 175 watt GE luminaires for use on 6.6 amp constant current circuit  (Read 624 times)
Ugly1
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175 watt GE luminaires for use on 6.6 amp constant current circuit « on: May 19, 2017, 04:46:50 PM » Author: Ugly1
Item # 310372615814 on ebay. Fairly uncommon 175 watt mercury vapor GE luminaire equipped with series ballast. Kind of high priced,over $200 with shipping.
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Lumex120
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Re: 175 watt GE luminaires for use on 6.6 amp constant current circuit « Reply #1 on: May 19, 2017, 05:37:07 PM » Author: Lumex120
What is a series ballast?
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Ugly1
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Re: 175 watt GE luminaires for use on 6.6 amp constant current circuit « Reply #2 on: May 19, 2017, 07:36:53 PM » Author: Ugly1
  Series circuits have been used since the dawn of electric streetlighting. In the olden days, series streetlights were the only way to light extended areas. A single #6 or # 8 awg wire could be used for hundreds of small (600 or 1000 lumen) incandescent lamps. The constant current transformers used to supply series circuits are rated in kw. I believe that the largest constant current transformer that can  be pole mounted is 30kw. According to the GE catalog,the 175 watt series ballast has a "loading factor" of .4 kw, so a series circuit supplied by a 30kw constant current transformer could operate about 75 of these fixtures. The voltage of this series circuit would be about 2250. The voltage used in one fixture including ballast loss
equals (ohms law) voltage=wattage divided by current, voltage=200watts divided by 6.6 amps = about 30 volts per fixture, 
times 75= 2250 volts total.
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Re: 175 watt GE luminaires for use on 6.6 amp constant current circuit « Reply #3 on: May 20, 2017, 08:38:48 PM » Author: xelareverse
  Series circuits have been used since the dawn of electric streetlighting. In the olden days, series streetlights were the only way to light extended areas. A single #6 or # 8 awg wire could be used for hundreds of small (600 or 1000 lumen) incandescent lamps. The constant current transformers used to supply series circuits are rated in kw. I believe that the largest constant current transformer that can  be pole mounted is 30kw. According to the GE catalog,the 175 watt series ballast has a "loading factor" of .4 kw, so a series circuit supplied by a 30kw constant current transformer could operate about 75 of these fixtures. The voltage of this series circuit would be about 2250. The voltage used in one fixture including ballast loss
equals (ohms law) voltage=wattage divided by current, voltage=200watts divided by 6.6 amps = about 30 volts per fixture, 
times 75= 2250 volts total.
so I can run one of these off of 30 volts?
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Ugly1
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Re: 175 watt GE luminaires for use on 6.6 amp constant current circuit « Reply #4 on: May 21, 2017, 04:08:46 AM » Author: Ugly1
It should work if the power supply can furnish 6.6 amps at 30 volts.
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Lumex120
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Re: 175 watt GE luminaires for use on 6.6 amp constant current circuit « Reply #5 on: May 21, 2017, 07:49:47 AM » Author: Lumex120
I wonder if a variac would work?
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Re: 175 watt GE luminaires for use on 6.6 amp constant current circuit « Reply #6 on: May 21, 2017, 08:27:27 AM » Author: Ugly1
 I believe that would work. As you slowly raised the voltage,the lamp should ignite somewhere a little over 30 volts. You would need an ammeter in the the circuit to make sure you did not go much over 6.6 amps.
 There was a 400 watt mercury lamp( H1BA clear and H1BBC color improved) that worked without a ballast on 3.2 amp
series circuits. I believe there were problems with this type of system. The  lamp appeared in the GE catalogs from the mid 1950's to I think the early 70's.
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Re: 175 watt GE luminaires for use on 6.6 amp constant current circuit « Reply #7 on: May 21, 2017, 11:28:17 AM » Author: Lumex120

Are you planning on buying it? If you do that would be a very nice collection piece.
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Re: 175 watt GE luminaires for use on 6.6 amp constant current circuit « Reply #8 on: May 23, 2017, 08:32:43 PM » Author: Ugly1
 Too expensive,and besides,my house is a borderline hoarders house. No room left for more stuff!
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