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Author Topic: What is the most common cobra head to find in mercury vapor today?  (Read 1286 times)
Goodlighting2000
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What is the most common cobra head to find in mercury vapor today? « on: August 21, 2026, 05:22:38 AM » Author: Goodlighting2000
What’s the most common cobra head to find in mercury vapor?
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LightsoftheWest
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Re: What is the most common cobra head to find in mercury vapor today? « Reply #1 on: August 21, 2026, 04:49:17 PM » Author: LightsoftheWest
For vintage era, any old GE or Westinghouse model.

For modern era, most likely a Cooper OVX or an AEL Series 113.
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joseph_125
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Re: What is the most common cobra head to find in mercury vapor today? « Reply #2 on: August 21, 2026, 05:55:22 PM » Author: joseph_125
For a while in my area it was LM Unistyles, Powerlite B2227, and McGraw Edison Unidors.
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Flatbottom
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Re: What is the most common cobra head to find in mercury vapor today? « Reply #3 on: August 25, 2026, 04:53:45 PM » Author: Flatbottom
GE M400s in my area
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HomeBrewLamps
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Re: What is the most common cobra head to find in mercury vapor today? « Reply #4 on: August 26, 2026, 06:15:30 AM » Author: HomeBrewLamps
My area is definitely 2nd generation GE M400's (late 60s era).

Second most common is ITT Model 13's.

Third most common is Holophane Spanwire lights. Viscount I believe is the model. I dont recall for sure.
« Last Edit: August 26, 2026, 06:23:00 AM by HomeBrewLamps » Logged

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Goodlighting2000
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Re: What is the most common cobra head to find in mercury vapor today? « Reply #5 on: August 26, 2026, 02:56:19 PM » Author: Goodlighting2000
In certain parts of the Carolina’s, California, etc, MV seems common.
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Goodlighting2000
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Re: What is the most common cobra head to find in mercury vapor today? « Reply #6 on: August 26, 2026, 02:56:54 PM » Author: Goodlighting2000
Quote from: HomeBrewLamps on August 26, 2026, 06:15:30 AM
My area is definitely 2nd generation GE M400's (late 60s era).

Second most common is ITT Model 13's.

Third most common is Holophane Spanwire lights. Viscount I believe is the model. I dont recall for sure.

What posr tops, NEMAs, floodlights, etc do you most commonly find in MV?
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WorldwideHIDCollectorUSA
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Re: What is the most common cobra head to find in mercury vapor today? « Reply #7 on: September 14, 2026, 07:29:03 PM » Author: WorldwideHIDCollectorUSA
Here in greater Los Angeles, I often see mercury vapor acorn post tops in certain neighborhoods.
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Lightingeye60
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Re: What is the most common cobra head to find in mercury vapor today? « Reply #8 on: September 14, 2026, 10:33:45 PM » Author: Lightingeye60
GE M400 or M250
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Lightingeye60
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Re: What is the most common cobra head to find in mercury vapor today? « Reply #9 on: September 14, 2026, 10:37:19 PM » Author: Lightingeye60
Quote from: Goodlighting2000 on August 26, 2026, 02:56:54 PM
What posr tops, NEMAs, floodlights, etc do you most commonly find in MV?

Post tops? Probably a GE TC-100, Cooper/McGraw Traditionaire or American Electric/ITT 247, followed by the GE PM series, the comtempo, etc. Cobras? Probably GE M250, American Electric series 13 or 25, or M400. NEMA’s? AEL series 11, Cooper/Westinghouse RMA, GE 201SA.

For more modern cobras, the most common fixtures to find in MV would be 80s era M400’s/M250’s or American Electric 113’s.
« Last Edit: September 14, 2026, 10:40:03 PM by Lightingeye60 » Logged
Econolite03
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Re: What is the most common cobra head to find in mercury vapor today? « Reply #10 on: September 15, 2026, 02:42:17 AM » Author: Econolite03
1960s GE M-250Rs.
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