Author Topic: Running 25w F32T8 lamps on magnetic F32T8 ballast?  (Read 287 times)
Lightingguy1994
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Running 25w F32T8 lamps on magnetic F32T8 ballast? « on: February 16, 2018, 05:07:53 PM » Author: Lightingguy1994
I'm wondering is it is good long term to use the energy saving 25w F32T8 lamps on magnetic ballasts. The other day, out of curiosity I put a pair of 25w tubes on a rapid start T8 ballast and to my surprise it lit up perfectly fine and still had decent brightness. You can view the post about it Here .

It seemed to run great, no flicker, no extra buzzing, ballast didnt get any hotter. The system current and wattage draw was a bit lower than it is with 32w lamps but seems within reason. What do you guys think ? Based on how great my test was I would consider using the 25w F32s on magnetic T8 but need to know for sure if nothing gets harmed, to hot or killed.

These were the running power draw readings

Running voltage (Red-Blue)
226-228V

Kill-A-Watt
49W
0.42A
0.96PF
« Last Edit: February 16, 2018, 05:10:22 PM by Lightingguy1994 » Logged
Lightingguy1994
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Re: Running 25w F32T8 lamps on magnetic F32T8 ballast? « Reply #1 on: February 17, 2018, 01:09:18 PM » Author: Lightingguy1994
Ok, to hopefully increase my chance of getting an answer, here is my question simplified.

Will the ballast be harmed by using these lamps if the ballast runs at lower watts and system current than it otherwise would with regular lamps.
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xmaslightguy
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^homebuilt fixture


GoL ATL
WWW
Re: Running 25w F32T8 lamps on magnetic F32T8 ballast? « Reply #2 on: February 17, 2018, 01:25:02 PM » Author: xmaslightguy
Does the label list anything other than F32's ?
If it also lists the 3' F25T8 and/or 2' F17T8 it'll be just fine Smiley

---
If not:
You could also set it up and let it run for atleast a hour with standard F32's, and feel how hot  it gets.
Then let it fully cool off and try the same with your ES lamps ... if it runs hotter, then you know to stay  with normal lamps
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Colored Fluorescent's such as F40T12 Red or  Green or Blue are awesome...

Ash
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Re: Running 25w F32T8 lamps on magnetic F32T8 ballast? « Reply #3 on: February 17, 2018, 01:28:59 PM » Author: Ash
Do the same measurements with the proper lamp and we'll see what the difference is

The ballast can be damaged in 2 ways :

 - By overheating. If you feel it is not, it most likely isn't. The ballast losses can be calculated from the measuremenmts and compared to try to get a more precise answer

 - By overvoltage of the capacitor built into the ballast, if there is any. If you can measure the lamp current (with a clamp meter, or at least by disconnecting one pin - if it does not affect the brightness of the working lamp), and if we know the ballast' internal schematic, we can estimate how the capacitor voltage in this case compares to when used with the correct lamps
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