Re: what type of incadescent bulbs did old streetlights use ? « Reply #1 on: July 16, 2006, 05:07:50 AM » Author: Silverliner
Hi Prawnman88, your Form 79 with the mogul socket tells me it is a 295 watt, 4000 lumen unit. 4000 nominal lumen multiple lamps come in 295 or 327 watt, depending on the life hours. I am not presently aware of any source where you can get a 295 or a 327 watt lamp, but you can use an ordinary clear 300 watt mogul based lamp. The glass shape, filament shape (horizontally mounted C shaped ring filament with 3 supports), and length are exactly the same as the 295/327 watt lamps so you'll still get the correct optics from your Form 79. Electrical stores should the clear mogul based 300 watt bulbs. I know the local one in my area does, they also carry 500 watt incandescents. Hope this helps!
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	Re: what type of incadescent bulbs did old streetlights use ? « Reply #4 on: July 16, 2006, 08:57:21 AM » Author: TudorWhiz
Dave (Silverliner) told me that your Form 79 is from the 1940s to 1950s...
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	Re: what type of incadescent bulbs did old streetlights use ? « Reply #5 on: July 16, 2006, 03:17:37 PM » Author: NiMo
It's also possible that your form 79 used series incandescent lamps rather than multiple.  The differences between the series and multiple are: 1) the filament is a CC-2V filament rather than the CC-8 of the multiple. 2) series lamps cannot poerate on standard current, and are rated at lumens. I believe you can operate either on that socket, though.
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	Re: what type of incadescent bulbs did old streetlights use ? « Reply #7 on: August 04, 2006, 01:23:50 PM » Author: TudorWhiz
oh yeah! I love old stuff!!!! they should be respected!
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	Re: what type of incadescent bulbs did old streetlights use ? « Reply #8 on: August 22, 2006, 08:51:34 PM » Author: Silverliner
Yep the US special street lighting lamps had odd wattages so they can provide the fixed lumen ratings.
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	Re: what type of incadescent bulbs did old streetlights use ? « Reply #10 on: November 29, 2007, 12:12:11 AM » Author: Silverliner
You meant 620w and 860w, these were the two highest wattages in multiple street lighting lamps. You are right the 6.6 amp series lamps are the most common, 15 and 20 amp series incandescent lamps were available in the past as well. In the Los Angeles area there are still thousands of 6.6 amp series incandescent street lights in use, as well as series mercury and HPS cobraheads, often shared with the incandescents on the same circuits. Quote from: fran4001 on November 23, 2007, 09:46:44 PM Here in northeast PA, we used medium based 58w, 103w, 189w and 202w. Mogul based lamps were 327w, 448w and one bigger one that escapes me right now. All to get the rated lumens, as mentioned before. Also, all the series streetlighting used mogul based lamps rated by amps I believe, and 6.6 was the common one I think.
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Member of L-G since 2005.

Collector of vintage bulbs, street lights and fluorescent fixtures.

Electrician.

Also a fan of cars, travelling, working out, food, hanging out.

Power company: Southern California Edison.