How efficient are fluorescant tubes ?
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How efficient are fluorescant tubes ?
08-10-2014 9:16 AM
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When I was a kid, I was taught that it takes more electricity to turn a fluorescant tube on than to leave it running all day. I suspect that was an urban myth. but I have always lived by that premise.
Does anyone know the truth ? Can anyone disabuse me from this strange theory ?
Also, does a 100 watt fluorescant tube consume 100 watts all the time or again only when starting ?
The other worry is that they are very expensive and perhaps turning them on and off reduces their life. Does it ?
As I have to be more enrgy conscious now, I want to know whether to turn these tubes on and off or whether to leave them running.
Re: How efficient are fluorescant tubes ?
08-10-2014 10:07 AM
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Some potentially useful information here: http://energy.gov/energysaver/articles/when-turn-your-lights
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
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Re: How efficient are fluorescant tubes ?
08-10-2014 1:38 PM
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Re: How efficient are fluorescant tubes ?
08-10-2014 1:41 PM
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Quote from: nanotm you can get led versions of most tube lights now <snip> use significantly less electric..
and they should last longer, contain less harmful substances etc. L
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
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Re: How efficient are fluorescant tubes ?
08-10-2014 1:41 PM
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More expensive too, certainly vs standard tubes.
For now my main kitchen (and garage) lighting will remain as standard fluorescent tubes.
As for the pollution issue, I'll await some more information on what's involved in the manufacture of LED's.
Re: How efficient are fluorescant tubes ?
08-10-2014 1:44 PM
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Re: How efficient are fluorescant tubes ?
08-10-2014 1:50 PM
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Really? Can you translate EUP and provide a link please to inform us.
Quote from: nanotm the EUP is planning on making the sale of traditional fluorescent tubes a thing of the past
There are definitely plans to phase out older inefficient fluorescent lighting in street lamps as there are much better alternatives for such high-output uses, but in domestic use that is a surprise.
Re: How efficient are fluorescant tubes ?
08-10-2014 1:50 PM
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Quote from: HPsauce I've looked at the output of LED's per watt recently and they don't seem any more efficient than fluorescent tubes (or CFL's for that matter).
Not sure I'd agree, LEDs should be more efficient on average - in my experience an LED bulb runs a lot cooler than a CFL, the heat is pretty much a measure of inefficiency.
Don't forget, one of the reasons that the inventors of blue LEDs got a Nobel prize is because their invention contributes to potential lowering of future CO2 emissions because it allows more efficient lighting to be developed.
At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
Re: How efficient are fluorescant tubes ?
08-10-2014 1:52 PM
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Remember, early LED's were just red so not much use for general lighting.
Have read on the packaging of lumens vs wattage; you'll be surprised.
By the way my LED bulbs get quite warm.
But yes, overall I think modern LED's are somewhat more efficient than CFL's though pretty much in line with fluorescent tubes.
Edit: This article suggests LED's have the edge by maybe 30% (at a price) http://www.premierltg.com/should-you-replace-your-t8-fluorescent-lamps-with-t8-led-tubes-2/
Re: How efficient are fluorescant tubes ?
08-10-2014 2:02 PM
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At any given moment in the universe many things happen. Coincidence is a matter of how close these events are in space, time and relationship.
Opinions expressed in forum posts are those of the poster, others may have different views.
Re: How efficient are fluorescant tubes ?
08-10-2014 2:03 PM
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Re: How efficient are fluorescant tubes ?
08-10-2014 2:09 PM
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EUP is European Union Parliament, its one of many proposed legislative changes on the cards to do with energy saving for future directives to be issued from like the ones already issued to lower the maximum wattage of vacuum cleaners and stop sales of incandescent light bulbs ....
Re: How efficient are fluorescant tubes ?
08-10-2014 2:22 PM
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since that would be moderately recent & not as ancient as some of your former missing links
Then others could Dot the I's & Cross the T's to make an informed decision
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Re: How efficient are fluorescant tubes ?
08-10-2014 4:26 PM
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Quote from: nanotm you can get led versions of most tube lights now so it might be worthwhile checking to see if you can replace yours with one, sure the led tubes cost more than the fluorescent tubes do but they use significantly less electric and don't require a starter either not to mention they don't suffer from the same epilepsy triggering flicker common with many fluorescent tubes
Flashing lights are relevant at 5-10Hz and affect only about 3% of epilepsy sufferers.
So a frequency of 50-100Hz(?) wouldn't be relevant.
"In The Beginning Was The Word, And The Word Was Aardvark."
Re: How efficient are fluorescant tubes ?
10-10-2014 11:36 AM
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Interesting point about LED's getting warm.
Quote from: w23 My LED bulbs get distinctly warm but I nearly burned my hand some time ago when I went to remove a CFL just after switching it off - it was a LOT warmer than my current LEDs (individual ones may vary, I usually look for ones with a good lumens/Watt ratio).
We have a lamp using LED'S that gets very warm they are rated at 240v / 12v but a few weeks ago we had another lamp with a G4 bulb in that also got hot and the bulb had blown so I purchased a small transformer and a replacement 12v led that clearly stated a transformer had to be used.
Result, a light as bright as the G4 bulb with no heat generated and it takes so little energy it does not even show on my energy monitor.
The LED is rated at 12v 1.5 amps.
Total cost was under a tender.
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