Author Topic: Request for correct arc-tube size of mercury lamps  (Read 417 times)
lights*plus
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Request for correct arc-tube size of mercury lamps « on: January 16, 2024, 12:31:17 AM » Author: lights*plus
I've got a good mercury lamp without an etch. I'm not sure if it's 100w or 175w. I can see the arc-tube but it's not clear to me which watt it's suppose to be because I only have a few "cheap" clear lamps.

Since there are members here fond of "good quality" clear mercury lamps, could you take out a ruler and measure for me the correct size of the arc-tube? Is there a list or catalog somewhere where the correct volumes are stated for the 100w, 175w and the 250 watt tubes?

 
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Philips tigkas
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Re: Request for correct arc-tube size of mercury lamps « Reply #1 on: February 25, 2024, 02:52:59 PM » Author: Philips tigkas
Interesting :wndr:
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Re: Request for correct arc-tube size of mercury lamps « Reply #2 on: February 25, 2024, 02:55:26 PM » Author: Philips tigkas
I have some 250w and some 125w but are all frosted so I can't really tell.
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Re: Request for correct arc-tube size of mercury lamps « Reply #3 on: February 25, 2024, 04:30:19 PM » Author: wide-lite 1000
 100w is easy as they come in a smaller bulb size than the 175/250w . Mogul base 100w will have either a ED-23 1/2 or BT-25 bulb .  100w arc-tube is rather tiny : 2 1/2" total length roughly 7/16" dia. . 175w tube looks to be roughly 3 3/8" total length  , roughly 1/2" dia.  . 250w tube looks to be 4" total length roughly 5/8" dia. .

 Hope this helps !
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Re: Request for correct arc-tube size of mercury lamps « Reply #4 on: February 25, 2024, 07:45:41 PM » Author: lights*plus
The diameter of my arc-tube is roughly 5/8" & the length 2 1/2". So I think I got a 100w. Somehow I thought the arc-tube was too large to be 100w. This lamp is well made and has plenty of life left, so that's why I kept it. Thanks for the valuable info.
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Re: Request for correct arc-tube size of mercury lamps « Reply #5 on: February 25, 2024, 07:55:39 PM » Author: wide-lite 1000
 My measurements came from a GE 100w , a Westy 175w & a Tungsram made 250w
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