Author Topic: What does an old fluorescent tube cost to run?  (Read 275 times)

Jaded

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  • Formerly known as Jaded
What does an old fluorescent tube cost to run?
« on: November 17, 2020, 12:46:34 pm »
I thought someone here might be able to quickly answer - I've trawled around the internet and can tell you about lots of other light fittings!

This is a bog standout old school tube light fitting with ballast and start etc. Roughly what would it cost per hour (or other time length)

T in advance!
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robgul

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Re: What does an old fluorescent tube cost to run?
« Reply #1 on: November 17, 2020, 01:25:52 pm »
I thought someone here might be able to quickly answer - I've trawled around the internet and can tell you about lots of other light fittings!

This is a bog standout old school tube light fitting with ballast and start etc. Roughly what would it cost per hour (or other time length)

T in advance!

I don't know the answer - but do recall that many, many years ago when I had a factory I was told that the longer tube fittings used less juice "per foot" than shorter ones - IIRC we had some 8 footers.  That may be horse-shit but I can see the sort of logic.
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Re: What does an old fluorescent tube cost to run?
« Reply #2 on: November 17, 2020, 01:33:37 pm »
Around 50W so 1/20 kWh/h, so between ½&1p per hour.

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Tim Hall

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Re: What does an old fluorescent tube cost to run?
« Reply #3 on: November 17, 2020, 01:35:50 pm »
The 1500mm 4000lm one I replaced at the weekend was stamped 58W.  My Smartmeter readout thing changed by around 75W when I switched it off.
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Jaded

  • The Codfather
  • Formerly known as Jaded
Re: What does an old fluorescent tube cost to run?
« Reply #4 on: November 17, 2020, 01:47:48 pm »
That's helpful, thanks.
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Re: What does an old fluorescent tube cost to run?
« Reply #5 on: November 17, 2020, 01:52:49 pm »
A good rule of thumb is 1W on 24/7 for a year costs £1.
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Re: What does an old fluorescent tube cost to run?
« Reply #6 on: November 17, 2020, 06:32:18 pm »
Industrial quantity power consumers* used to run their lights for 'free', the leading phase angle of the discharge lights compensating for all the lagging induction motors. *Big enough to be charged for reactive loading,