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Duro-Test 40w Cool White Double Cathode Power Twist

Duro-Test 40w Cool White Double Cathode Power Twist

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Found this at ReStore the other day, what's unusual about this lamp is that its an ordinary cool white. Most Power-Twist lamps were 5500K full spectrum daylight.

2010-12-20_21-29-04_99.jpg 2010-12-18_21-55-38_666.jpg Dave_D_Pic_6.jpg Dave_D__Pic_1.jpg

Light Information

Light Information

Manufacturer:Duro-Test
Model Reference:40w Cool White Power Twist
Lamp
Shape/Finish:TH12
Service Life:33000 hours
Electrical
Wattage:40w
Optical
Color Temperature:4200K
Color Rendering Index:62
Physical/Production
Dimensions:48 nominal inches
Factory Location:Clifton, NJ USA
Fabrication Date:1976

File information

File information

Download: Download this File
Filename:Dave_D_Pic_6.jpg
Album name:silverliner / Fluorescent - T-12 and larger
Keywords:Lamps
File Size:200 KB
Date added:Sep 10, 2010
Dimensions:1024 x 768 pixels
Displayed:499 times
Date Time:2010:09:10 23:47:38
DateTime Original:2010:09:10 23:47:38
Exposure Bias:0 EV
Exposure Time:50000/1000000 sec
FNumber:f 2.8
Flash:No Flash
Focal length:4.97 mm
ISO:356
Make:Motorola
Model:DROIDX 7daa00017ff00000015a7d751702002d
Software:2.1-update1
White Balance:0
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RCM442
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Sep 10, 2010 at 10:25 PM Author: RCM442
The question is, will the lumen output drop majorly as it reaches EOL?

Linear fluorescent will never lose to LED!
I am not Anti-LED, as I have some in use at my house.
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Sep 10, 2010 at 10:26 PM Author: arcblue
I didn't know Duro-Test made any cool whites in the PowerTwist style. And what does the "double cathode" refer to? Are there two filaments on each end? Awesome find!

I'm lampin...

don93s
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Sep 11, 2010 at 09:39 AM Author: don93s
Beautiful lamp, Dave. Do these have initial lumens published?
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Robert


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Sep 11, 2010 at 11:46 AM Author: rjluna2
Ohhh.. Nice find, Dave. At least I now know the power-twist F40T12 concept is older than I lead to think.

Pretty, please no more Chinese failure.

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Sep 11, 2010 at 12:20 PM Author: DieselNut
I have a friend who is supposed to be bringing me some PowerTwist lamps. As soon as they are here, I will photograph and post them. Nice find. I love the look of these and the PowerGroove lamps.

Preheat Fluorescents forever!
I love diesel engines, rural/farm life and vintage lighting!

xmaslightguy
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^homebuilt fixture


GoL ATL
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Sep 11, 2010 at 01:42 PM Author: xmaslightguy
Great find!
Love the look of PowerTwist lamps

Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

Silverliner
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Verd a ray classic.


GoL
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Sep 11, 2010 at 02:35 PM Author: Silverliner
RCM, most phosphors hold up well for 33000 hours so it shouldn't be a problem.

Arcblue, yes there are two filaments. A main electrode and an auxilary electrode. That brings life to 33000 hours. I have seen some that looked spent but were still functional due to the second electrode.

Don93s, I don't have the published info on hand right now, but it looks brighter than a F40CW. I'd say about 3300 intial lumens.

Rjluna2, the power twist lamp was introduced in '61. Yeah quite a while ago!

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

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Sep 11, 2010 at 03:25 PM Author: DimBulb
Very cool!!!! I wonder if they also produced Warm White or other colors?

My very first word was LIGHT!

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Robert


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Sep 11, 2010 at 05:10 PM Author: rjluna2
@silverliner: Do Duro-Test continues to make Power-Twist bulb?

I know that you have dated my bulb as late as October 1983 as shown at Duro-Lite.

Pretty, please no more Chinese failure.

Silverliner
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Verd a ray classic.


GoL
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Sep 11, 2010 at 05:36 PM Author: Silverliner
No, production of the powertwist lamps stopped in February 2000.

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

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Sep 11, 2010 at 09:04 PM Author: RCM442
Why did the production stop?!

Linear fluorescent will never lose to LED!
I am not Anti-LED, as I have some in use at my house.
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Silverliner
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Verd a ray classic.


GoL
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Sep 11, 2010 at 10:40 PM Author: Silverliner
To make a long story short, the old Duro-Test closed down along with the factory during said date due to bad ownership by another company. Duro is back in business but no longer make power twists.

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

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My idol is Mylene Farmer, deal with it.


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Apr 24, 2014 at 09:56 AM Author: vytautas_lamps
if the Duro-test tubes has a brilliant full spectrum cool daylight,I can NOT imagine how beautifully the cool white would light up?

New lighting technologies is a pity fest everywhere you look. From LEDs that last only for two months, to a never-ending global starvation of t8 fluorescent tubes.
We shall reinforce ourselves with good old full mercury t12s and HIDs made to surpass one's life, and give them all the middle finger ;

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