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How much are my downlighters costing me to run?

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  • 22-12-2011 4:31pm
    #1
    vicwatson
    Registered Users Posts: 28,404 ✭✭✭✭


    8 x 50w GU10's - how can I calculate how much this costs me per hour to have switched on?

    Thanks


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    #2
    DublinDilbert
    Registered Users Posts: 5,379 ✭✭✭DublinDilbert


    8 x 50 = 400w so say 500w. Electricity is sold by the killo watt hour, eg 1000w for 1 hour = 1 unit.

    Based on your 500w load, you'll use a unit every 2 hours.


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    #3
    vicwatson
    Registered Users Posts: 28,404 ✭✭✭✭vicwatson


    DublinDilbert wrote: »
    8 x 50 = 400w so say 500w. Electricity is sold by the killo watt hour, eg 1000w for 1 hour = 1 unit.

    Based on your 500w load, you'll use a unit every 2 hours.

    Thanks

    So say Electric Ireland charge of 15.59cent per kw/h I'm paying 15.59 cent plus vat per 2 hours? Have I that right?


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    #4
    DublinDilbert
    Registered Users Posts: 5,379 ✭✭✭DublinDilbert


    vicwatson wrote: »
    Thanks

    So say Electric Ireland charge of 15.59cent per kw/h I'm paying 15.59 cent plus vat per 2 hours? Have I that right?

    Exactly!

    I did round up to simplify the calcs, in theory your looking at

    1000/400 = 2.5 hours per unit. So you get 2.5 hours for 16 cents.


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    #5
    paddy147
    Banned (with Prison Access) Posts: 15,858 ✭✭✭✭paddy147


    LEDS are the only way to go,thats all I will say.


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    #6
    paddymick
    Registered Users Posts: 227 ✭✭paddymick


    paddy147 wrote: »
    LEDS are the only way to go,thats all I will say.

    ^^^^^^^^^ What he said

    Instead of using 400w it would be more like 24w..No brainer really;)


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    #7
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,592 Mod ✭✭✭✭2011


    paddy147 wrote: »
    LEDS are the only way to go,thats all I will say.
    Not always.

    For example I have a room that has a single 20W halogen. This light is on for about 5 minutes a day (at a daily ESB cost €0.0002666667).

    Therefore if I replaced it with an LED lamp I may not make a net saving within my lifetime!

    I estimate that it will cost me about €2 in energy costs to use this light at this rate for 20 years.


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    #8
    paddy147
    Banned (with Prison Access) Posts: 15,858 ✭✭✭✭paddy147


    2011 wrote: »
    Not always.

    For example I have a room that has a single 20W halogen. This light is on for about 5 minutes a day (at a daily ESB cost €0.0002666667).

    Therefore if I replaced it with an LED lamp I may not make a net saving within my lifetime!

    I estimate that it will cost me about €2 in energy costs to use this light at this rate for 20 years.


    Eh,my post was posted in direct relation to what the OP posted and also staying on topic.


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    #9
    2011
    Moderators, Home & Garden Moderators, Technology & Internet Moderators, Regional East Moderators Posts: 12,592 Mod ✭✭✭✭2011


    paddy147 wrote: »
    Eh,my post was posted in direct relation to what the OP posted and also staying on topic.
    Not my tiny under stairs bathroom then??

    :D:D


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