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Interesting old preheat F40T12 U-bend recessed troffers

Interesting old preheat F40T12 U-bend recessed troffers

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Serviced an office building that had several rooms containing these 2x2' recessed troffers that contained preheat magnetic ballasts (some very noisy) and interesting 70's-looking diffusers. The diffusers appear to be an early polycarbonate as they were all slightly yellowed when the fixtures were turned off. Most of them contained GE Mod-U-Line lamps in color 3500K or 3000K, I dont remember which, they were definitely halophosphate lamps though. There was a scattering of Sylvania 4100K's too.

20190213_192950.jpg 20181030_191055.jpg 20190111_174349.jpg FB_IMG_1544823557739.jpg

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Filename:20190111_174349.jpg
Album name:BlueHalide / New album
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Date added:Jan 11, 2019
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Date Time:2019:01:11 17:43:49
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BlueHalide
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Jan 11, 2019 at 10:53 PM Author: BlueHalide
Any idea of the age of these? These yellowed "crosshatch" diffusers screams 1970's to me, maybe im wrong. Also, I never knew these U-bent T12 fixtures were made in preheat at one time
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Jan 11, 2019 at 10:55 PM Author: Lumex120
I have no idea who made these, but my local USPS office used to have these in the lobby before they were replaced with LED panels in 2016 or so. They weren't yellowed at all and they seemed to have cool white F32T8 lamps in them.

Any machine is a smoke machine if you operate it wrong enough.

BlueHalide
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Jan 11, 2019 at 11:04 PM Author: BlueHalide
Yeah, these were definitely pre-2000's as they had the old "Union-made" stickers in them. The preheat ballasts had nothing that resembled a date code, they were Sylvania, and many still had metal-can starters installed. About 30% of the fixtures had rapid start ballasts installed (assuming replacements).
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Mike McCann


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Jan 12, 2019 at 09:50 PM Author: streetlight98
Wow preheat u-bend troffers? Weird! I never knew they made them either!

To resist is to piss in the wind, anyone who does will end up smelling.

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Verd a ray classic.


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Jan 13, 2019 at 01:23 AM Author: Silverliner
Preheat U bents wow that's rare. U bents didn't come out in the USA until 1968. By 1968 rapid start had pretty much taken over in new fixture installs. So you certainly maintained a very obscure lighting system. I knew U bents were operated on preheat though, but in like signs etc but not these troffers.

May all the great lighting technologies have their place in history.

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