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  • FIRST POST
    • hemophobic
    • By hemophobic 14th Mar 18, 11:52 AM
    • 727Posts
    • 473Thanks
    hemophobic
    Switching to LED bulbs
    • #1
    • 14th Mar 18, 11:52 AM
    Switching to LED bulbs 14th Mar 18 at 11:52 AM
    At the moment I have a 5 bulb chandelier type fitting in the centre of my living room, and another in my dining room. I want to get LED bulbs but since I don't want to buy 10 I was going to replace the light fitting with a single pendant. I am wondering if that will be bright enough? The rooms are both approx 3x4m and joined with an arch. I already have some hive bulbs so I would be using those.

    I would also have 2 floor lamps in the living room.
Page 1
    • FreeBear
    • By FreeBear 14th Mar 18, 1:36 PM
    • 1,538 Posts
    • 2,291 Thanks
    FreeBear
    • #2
    • 14th Mar 18, 1:36 PM
    • #2
    • 14th Mar 18, 1:36 PM
    My lounge is around the same size (3.6mx3.9m) and has a single 10W pendent in the middle of the ceiling. No problem at all with the level of illumination.
    Her courage will change the world.

    Treasure the moments that you have. Savour them for as long as you can for they will never come back again.
    • telemarks
    • By telemarks 14th Mar 18, 2:00 PM
    • 161 Posts
    • 115 Thanks
    telemarks
    • #3
    • 14th Mar 18, 2:00 PM
    • #3
    • 14th Mar 18, 2:00 PM
    LED bulbs come in a wide range of light outputs, styles of bulb and colours of light (from ice blue white, through to candle yellow). You will easily be able to find a bulb the right size bulb(s) for your room

    If you like the "5 bulb chandelier type fitting" don't discout using it with LED bulbs on cost alone as these are often under 2 each, and sometimes a cheap as 45p each

    Screwfix have a good selection, all sorted by fitting (the socket) but you do need to look carefully at the power (measured in lm or wattage equiv.) and colour of the light (warm/cold measured in K) as the choice is so wide.

    We're all LED here now, even downlight spots, all from Screwfix, and I'm a bit fan of the vintage filiment bulbs, like this.
    Last edited by telemarks; 14-03-2018 at 2:15 PM.
    • jack_pott
    • By jack_pott 14th Mar 18, 2:36 PM
    • 4,561 Posts
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    jack_pott
    • #4
    • 14th Mar 18, 2:36 PM
    • #4
    • 14th Mar 18, 2:36 PM
    I decided years ago to replace each tungsten bulb with CFL/LED as it failed. In 16 years since then, only one of the 12 tungstens has failed, so I still haven't used up the two spares I had in the cupboard.
    I'm not upset that you lied to me, I'm upset that from now on I can't believe you.
    Friedrich Nietzsche
    • telemarks
    • By telemarks 14th Mar 18, 2:58 PM
    • 161 Posts
    • 115 Thanks
    telemarks
    • #5
    • 14th Mar 18, 2:58 PM
    • #5
    • 14th Mar 18, 2:58 PM
    I decided years ago to replace each tungsten bulb with CFL/LED as it failed. In 16 years since then, only one of the 12 tungstens has failed, so I still haven't used up the two spares I had in the cupboard.
    Originally posted by jack_pott
    arrrgh! Tungsten halogen bulbs = spawn of the devil! Enemy of the planet!

    If you don't agree, then count up the number of devil bulbs you have, and lets do some back of envolope maths on the elcie usage over 16 years ...

    Hidden back of envolope .... Assuming replacing old school 60w incadesant bulb on about 3 hours a day = about 1000 hours a year:
    - Ancient 60W incandesent = 60kW/h @ say 15p = 9 per year.
    - Evil 46W tungsten halogen = 46kW/h @ say 15p = 6.90 per year.
    - Tree hugging 7.6W LED = 7.6kW/h @ say 15p = 1.14 per year.
    Tree hugging bulb saves 5.76 per year and as it cost 1.79 pays for itself in under 4 months
    • jack_pott
    • By jack_pott 14th Mar 18, 3:26 PM
    • 4,561 Posts
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    jack_pott
    • #6
    • 14th Mar 18, 3:26 PM
    • #6
    • 14th Mar 18, 3:26 PM
    arrrgh! Tungsten halogen bulbs = spawn of the devil! Enemy of the planet!

    If you don't agree, then count up the number of devil bulbs you have, and lets do some back of envolope maths on the elcie usage over 16 years ...

    Hidden back of envolope .... Assuming replacing old school 60w incadesant bulb on about 3 hours a day = about 1000 hours a year:
    - Ancient 60W incandesent = 60kW/h @ say 15p = 9 per year.
    - Evil 46W tungsten halogen = 46kW/h @ say 15p = 6.90 per year.
    - Tree hugging 7.6W LED = 7.6kW/h @ say 15p = 1.14 per year.
    Tree hugging bulb saves 5.76 per year and as it cost 1.79 pays for itself in under 4 months
    Originally posted by telemarks
    This is nonsense because you're starting off with nonsense assumptions. I have more than the back of an envelope, it's all on a spreadsheet.

    Firstly, the kitchen is a 4' fluorescent tube, and the lounge has been a CFL for most of the last 15 years. That's most of the lighting hours in my house accounted for, the remainder are only on for minutes at a time. (Ones like loft, cupboard under stairs, garage, spare bedrooms etc can be measured in seconds per month virtually)

    And therein lies the whole point: by changing the right bulbs you can get something like 80% of the energy saving for 20% of the capital outlay - cost effective by anyone's measure. If I had replaced all the bulbs many would have never paid for themselves in my lifetime.

    See Pareto Principle.

    (The payback period for the lights in the spare bedrooms would be about 400 years.)
    I'm not upset that you lied to me, I'm upset that from now on I can't believe you.
    Friedrich Nietzsche
    • telemarks
    • By telemarks 14th Mar 18, 3:47 PM
    • 161 Posts
    • 115 Thanks
    telemarks
    • #7
    • 14th Mar 18, 3:47 PM
    • #7
    • 14th Mar 18, 3:47 PM
    Nonsense is far,far too strong a word, the maths all stacks up.

    Do the sums yourself, even with bulbs that are "only on for minutes at a time", you will find less evil bulbs would have paid for themselves several times over the years.
    Last edited by telemarks; 14-03-2018 at 4:03 PM.
    • getmore4less
    • By getmore4less 14th Mar 18, 5:17 PM
    • 32,035 Posts
    • 19,222 Thanks
    getmore4less
    • #8
    • 14th Mar 18, 5:17 PM
    • #8
    • 14th Mar 18, 5:17 PM
    For low use luminaries you often save more by waiting for the price of the LED to drop than by replacing too early.
    • stator
    • By stator 14th Mar 18, 5:23 PM
    • 6,228 Posts
    • 4,110 Thanks
    stator
    • #9
    • 14th Mar 18, 5:23 PM
    • #9
    • 14th Mar 18, 5:23 PM
    You can buy LED bulbs up to 1500 lumens, so yes you'll be able to do it quite easily with a single bulb fitting
    Changing the world, one sarcastic comment at a time.
    • telemarks
    • By telemarks 14th Mar 18, 5:33 PM
    • 161 Posts
    • 115 Thanks
    telemarks
    For low use luminaries you often save more by waiting for the price of the LED to drop than by replacing too early.
    Originally posted by getmore4less
    Very true. I've waited until LED bulbs hit a quid or two price range before switching each socket type. But most bulb types are well past that point now.

    First to get replaced were the BC along with the ES. LED GU10 bulbs came cheap soon after, so I replaced all the MR16s with them. SES were next, but I had to wait until last year before I found SBC candles cheap enough in LED.

    Brighter G4's are still a bit pricey, along with G9's, and these were the last to be replaced recently on a "special" price.

    Granted some "odd" fittings like GR10 and GR8 will probably never be replaced by cheap LED, but as for the rest, they are all out their cheap enough now, no silly 10 per bulb prices.

    Don't you wish we could go back to just one type of bulb socket though!
    • EssexExile
    • By EssexExile 14th Mar 18, 5:47 PM
    • 2,816 Posts
    • 1,960 Thanks
    EssexExile
    For low use luminaries you often save more by waiting for the price of the LED to drop than by replacing too early.
    Originally posted by getmore4less
    Speaking of luminaries I see Stephen Hawking has died. I wouldn't call him low use though.
    Tall, dark & handsome. Well two out of three ain't bad.
    • jack_pott
    • By jack_pott 18th Mar 18, 2:22 PM
    • 4,561 Posts
    • 5,871 Thanks
    jack_pott
    Nonsense is far,far too strong a word, the maths all stacks up.

    Do the sums yourself, even with bulbs that are "only on for minutes at a time", you will find less evil bulbs would have paid for themselves several times over the years.
    Originally posted by telemarks
    I have done the maths. As I said, the problem with your argument is not that the maths is wrong, but the assumption that all my tungsten bulbs are on for several hours a day when they aren't.

    As I've already said, the lamps that are on for hours are not tungsten, and of the ones that are tungsten, none of the following bulbs will pay for themselves in my lifetime:

    Pantry (70 years)
    Shed
    Patio
    Cupboard under the stairs
    Back bedroom
    Small bedroom
    Loft (800 years)

    Compare that with the bulb in the lounge, which was changed 12 years ago, and paid for itself in a few months.

    Finally, it's also worth noting that the energy saving lamps in the lounge have lasted 3 years, 9 months, 2 yr, and 6yr. None of them anywhere near the claimed 10 years, which also impacts on the economics of changing bulbs that are little used.
    I'm not upset that you lied to me, I'm upset that from now on I can't believe you.
    Friedrich Nietzsche
    • telemarks
    • By telemarks 18th Mar 18, 3:06 PM
    • 161 Posts
    • 115 Thanks
    telemarks
    Methinks someone does protest too much.

    Doing the maths if you only use a bulb for seconds a day, as you say it will take many years before the energy costs warrant a replacement bulb.
    However what I said before is true
    even with bulbs that are "only on for minutes at a time", you will find less evil bulbs would have paid for themselves several times over the years.
    Going back to the OP, I wonder if they will return. Perhaps if they do they could save what wattage/type/and fitting bulbs they are using in their "5 bulb chandelier", then we would be better place to comment on LED equivalents
    Last edited by telemarks; 18-03-2018 at 3:11 PM. Reason: Added OP comment
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