11   General / Off-Topic / Re: What is your favorite vintage car?  on: February 17, 2026, 11:49:20 PM 
Started by Burrito - Last post by wide-lite 1000
Yep . 1974 Dodge Monaco .
 12   General / Off-Topic / Re: What is your favorite vintage car?  on: February 17, 2026, 11:37:17 PM 
Started by Burrito - Last post by Baked bagel 11
Dodge Monaco?
 13   General / Off-Topic / Re: What is your favorite vintage car?  on: February 17, 2026, 09:01:37 PM 
Started by Burrito - Last post by Econolite03
The car the Blue Brothers drove.
 14   General / Off-Topic / Re: What is your favorite vintage car?  on: February 17, 2026, 03:58:40 PM 
Started by Burrito - Last post by Baked bagel 11
Ford XC Flacon
 15   Lanterns/Fixtures / Vintage & Antique / Re: Help Identify Diffuser Lenses from c 1949 recessed Fluorescent Fixture  on: February 17, 2026, 03:03:43 PM 
Started by 1949 Chapel - Last post by lightsofpahrump
May I ask what size tube they use?
 16   Lanterns/Fixtures / Vintage & Antique / Re: Who made these?  on: February 17, 2026, 03:02:48 PM 
Started by Milwaukeeman2003 - Last post by lightsofpahrump
Yep, I think they're M-2s. Those are UNMISTAKEABLE! They could probably be mounted back to back, with a small arm (like the ones that attach a shoebox) holding each. Or they could be custom? IDK how they're mounted, but correct me if I'm wrong, i think they are M-2.
 17   General / General Discussion / Re: Residential vs Commercial Fluorescent Ballasts  on: February 17, 2026, 12:32:49 PM 
Started by Multisubject - Last post by Ash
F20T12 have about the same intensity as F40T12, a little less (1050lm 2ft F20T12 vs 2500lm 4ft F40T12 for 765)

I am trying to understand why then bare F40T12 was cosidered too high intensity in the US but ok in Europe

And why over the years bare incandescent lamps, T8, T5HO, and now even bare LED chips without any diffuser (in decorative luminaires for living room no less) became considered ok. What changed ?
 18   General / General Discussion / Re: Residential vs Commercial Fluorescent Ballasts  on: February 17, 2026, 10:03:18 AM 
Started by Multisubject - Last post by Medved
But the short F20 would have all the light concentrated into the short tube, so too bright.
The need is for lower intensity, larger surface light.
Yes, PMMA were used quite long, but if it needs to diffuse the light, it needs either some difraction pattern (the ridges then tend to hold the dust), or have some "milky paint", which tends to absorb a lot of light.
But if you look at common pricing, the F40T12 cost was about the same or frequently lower than the F20T12, the only reason being the F40 was manufactured and sold at way higher production volumes.
Originally the reduced intensity "residential" ballasts were designed to run the common F40 tubes, just at about 25W. Then dedicated 25W tubes appeared, with just thinner filament, to reduce the cathode heating power consumption when the cathode does not need to be that beefy for the reduced power. It is true the 25W version become a lower volume odd wattage tube (although sharing way more production tooling setup with the main highrunner than the F20T12), but the standard of using the lower power for residential applications was already set at the time the dedicated 25W version tube was introduced..
 19   General / General Discussion / Re: Residential vs Commercial Fluorescent Ballasts  on: February 17, 2026, 04:51:39 AM 
Started by Multisubject - Last post by Ash
Being T12 the lamp is fairly diffused already, its intensity (when looking at the lamp) is not as high as T8-T5. Diffusers made of PMMA sheet formed to the wanted shape with vacuum were used in luminaires already in the 70s if not 60s

The F20T12 was already made, its not like the F25T12 could eliminate all demand to F20T12 ever

And a choke (of the size of a PL choke for us) would definitely cost less than autotransformer ballast
 20   General / Off-Topic / Re: What is your favorite vintage car?  on: February 17, 2026, 03:12:44 AM 
Started by Burrito - Last post by SussexEuroSOX
One of these beauties Citroën DS 21!
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