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Thread: Money Saved on Electricity in One Year

  1. #49
    HEXUS.timelord. Zak33's Avatar
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    Re: Money Saved on Electricity in One Year

    Quote Originally Posted by htid View Post
    With regards to lightbulbs then, last night I went to have a look at my 6 kitchen GU10s (I only moved in a month ago and they were already here). 50w each! If I replace them with these, that's 273w saved each time! But before I go ahead, I just want to check that they are what I need...it looks like it but I'm not sure if there's anything I'm overlooking?
    lets do a quick calculation:

    Most people pay around 11p per KW hour

    6 bulbs either use 300w or 27w

    A KW hour with the 300w bulb drain takes only 3.33 hours to use.
    1 KW hour with 27w drain takes 37 hours to use.

    this in itself sounds impressive.

    Go deeper......

    Imagine the average kitchen lights are on for 3 hours per day every day, 365 days.
    365x3 = 1095 hours per year.

    300watt uses 328Kwh per year = £36 per year
    27watts uses 29.5 kwh per year = £3.25

    so a saving of close to £33 per year.

    Bulbs are gonna cost about £7.20 each. 6 of them is £43 plus potential postage.

    It'll pay for itself in about 18 months I guess... after that all profit... but..

    how long do they last these LED bulbs?

    Quote Originally Posted by Advice Trinity by Knoxville
    "The second you aren't paying attention to the tool you're using, it will take your fingers from you. It does not know sympathy." |
    "If you don't gaffer it, it will gaffer you" | "Belt and braces"

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    Hardcore Til I Die htid's Avatar
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    Re: Money Saved on Electricity in One Year

    Quote Originally Posted by snootyjim View Post
    They will work, but they aren't very bright.

    Something like this is much brighter.
    Interesting. I can't say I have any idea about all this, but I would have thought that if they are both equal to 50w, they will be the same brightness? I'm not saying I don't believe you obviously, I'm just curious how there's a difference.

    Zak, thanks for the info. I guess it's not that impressive when you get down to the nitty gritty, but to quote Tesco, "every little helps"!

  3. #51
    The late but legendary peterb - Onward and Upward peterb's Avatar
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    Re: Money Saved on Electricity in One Year

    Quote Originally Posted by htid View Post
    Interesting. I can't say I have any idea about all this, but I would have thought that if they are both equal to 50w, they will be the same brightness? I'm not saying I don't believe you obviously, I'm just curious how there's a difference.

    Zak, thanks for the info. I guess it's not that impressive when you get down to the nitty gritty, but to quote Tesco, "every little helps"!
    50W is the power consumption. A 50W light bulb and a 50W heater both consume the same power, but the heater gives out no visible light (at least not in the portion our eyes are sensitive to)

    Brightness partially subjective anyway, a lamp with a higher colour temperature will appear brighter than the equivalent lamp with a lower colour temperature, and the light output per watt of power input will depend on the conversion efficiency of the lamp. Incandescent lighting is inefficient because most of the output is in the part of the spectrum that our eyes are insensitive to. (Infra-red - which we detect as heat, in simplistic terms)

    Lamps are now marked in light output (in lumens) as well as power input. Two lamps with the same light output rating (in lumens) should appear equally bright, regardless of the input power.
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  5. #52
    jim
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    Re: Money Saved on Electricity in One Year

    Quote Originally Posted by htid View Post
    Interesting. I can't say I have any idea about all this, but I would have thought that if they are both equal to 50w, they will be the same brightness? I'm not saying I don't believe you obviously, I'm just curious how there's a difference.

    Zak, thanks for the info. I guess it's not that impressive when you get down to the nitty gritty, but to quote Tesco, "every little helps"!
    As Peter said, it's not really that exact. I doubt that any two bulbs "rated at 50w" put out the same amount of light.

    From experience, with LEDs, they really need to be direct light. If you get one where they're inside a fitting, the idea is that the light reflects off the silvered layer and shines through the glass. It does work, but I've found the light to be very dim. Having the LEDs external made a colossal difference.

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  7. #53
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    Re: Money Saved on Electricity in One Year

    Quote Originally Posted by Zak33 View Post
    how long do they last these LED bulbs?
    Very good points. As for longevity, I've thus far found LED bulbs (GU10 at least) to be unbreakable... never had a single one fail. The websites mention 5 years.

    The big reason I went for them was heat though. Having 5 bulbs like that on a low ceiling, and it gets incredibly uncomfortable, incredibly quickly.

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    Re: Money Saved on Electricity in One Year

    wear a hat



    Quote Originally Posted by Advice Trinity by Knoxville
    "The second you aren't paying attention to the tool you're using, it will take your fingers from you. It does not know sympathy." |
    "If you don't gaffer it, it will gaffer you" | "Belt and braces"

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    Re: Money Saved on Electricity in One Year

    I don't have enough headroom for a hat as well

  10. #56
    Senior Member Tobeman's Avatar
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    Re: Money Saved on Electricity in One Year

    Ah, this thread is brilliant. I'll be taking a few suggestions away myself.

    Talking of what my light fittings chuck out, and low ceilings, I live in a converted loft of an old Victorian building, and my light fitting in the kitchen is actually on the eaves rather than the ceiling (the "flat part" of the ceiling is about 5cm wide, the rest is all sloped... cool but a pain). The fitting takes FIVE bulbs, but I took two out because five was ridiculous. I have a luscious thick hair, but can feel the bulb pointing at the oven burning away probably singeing and thinning my hair!

    I'd like to look at swapping for LEDs. I know its pretty probably not the best demonstration, but has anyone got an "before" and "after" shots of rooms they have swapped like for like, before I make the plunge?

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    Re: Money Saved on Electricity in One Year

    Tobeman.... in all honesty. lets look at the facts....

    painting a room... £50 to £100 and lots of arse ache

    new bulbs.... £35.. and long term money saving potential... AND if you hate them, sell them on ebay. ... you'll get back half.

    So... no brainer,

    Quote Originally Posted by Advice Trinity by Knoxville
    "The second you aren't paying attention to the tool you're using, it will take your fingers from you. It does not know sympathy." |
    "If you don't gaffer it, it will gaffer you" | "Belt and braces"

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    Re: Money Saved on Electricity in One Year

    Yes. Though two bulbs may be both 50W, their brightness would still depend on their color temperatures (rated in Kelvin) that's why on the links posted above, one says warm white while the other says soft white (not to mention again that they're both 50W). Overall, it would depend on how much brightness you would like to have in a certain area of your house.

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    Re: Money Saved on Electricity in One Year

    Quote Originally Posted by Zak33 View Post
    B) But having said all that, I will only save money if it suits me. I won't change certain things, and pay for them. Energy saving bulbs are STILL rubbish. Either too slow to brighten, totally useless outside as security lights in winter. Some give such harsh light I just hate them.
    Try the "Tornado" bulbs if you can find them. They turn on to full brightness instantly.

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    Re: Money Saved on Electricity in One Year

    ^ That sounds interesting. I also might consider purchasing one.

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    Re: Money Saved on Electricity in One Year

    On the upside, I now have a nice, secure, dedicated (and external vented) server and hardware room.
    which is a handy heat source of its own in winter
    my Virtualisation Blog http://jfvi.co.uk Virtualisation Podcast http://vsoup.net

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    Re: Money Saved on Electricity in One Year

    Thought provoking Thread,

    I have a kitchen with eight 50W Halogens, and a bathroom also with eight 50W Halogens, and right from the start the obvious power consumption has been a source of dismay.

    However:

    The bathroom bubs are new, but the attrition rate among the kitchen bulbs makes 5 years at about £10 look reasonable for a single GU10 LED bulb, {and the fact it is sucking just over one tenth of the power becomes clear profit.}

    I'll be looking into this further, as soon as I've satisfied myself that by being GU10s, that means they are 240 Volts.

    Thanks to all contributors for opening my eyes to the existence of alternatives.

    Petra.

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    Re: Money Saved on Electricity in One Year

    Just read the other thread on GU10 bulbs, and followed the link to LedHut. Nice to see a retailer giving the full information on their product including the 'Input Power' {actually Voltage} of 240V.
    Also, discount for quantity. I'd have to buy 24 to replace all mine, and have a few spares, but I'd get 65p each off.

    I think it's a done deal.

    Petra.

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    HEXUS.timelord. Zak33's Avatar
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    Re: Money Saved on Electricity in One Year

    Petra.. glad this thread has asssisted someone else.

    Quote Originally Posted by Advice Trinity by Knoxville
    "The second you aren't paying attention to the tool you're using, it will take your fingers from you. It does not know sympathy." |
    "If you don't gaffer it, it will gaffer you" | "Belt and braces"

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