Is LED Lighting realy cheaper?

Discussion in 'Lighting' started by LCornelius, 19 Aug 2011.

  1. LCornelius

    LCornelius Moderator

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    Hi all,

    Am I missing something here?

    My light unit would be 2000 x 1000

    So 3 x 150w MH and 8 x 39w T5's = 762w per hour.

    If I go LED:
    120 x 3w White LED and 120 x 3w Blue LED = 720w per hour.

    According to stuff I found on the net I need 240 LED's
    12 rows of 20 LED's to cover the 2000 x 1000 area

    So what am I missing here?
    Is my calculation on the amount of LED's incorrect?
     
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  3. wukkie

    wukkie

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    I am not an expert, but as far as I know, 150w MH does not just draw 150w it draws a lot more than that. So you would have to consider that factor as well.
     
  4. mariusmeyer

    mariusmeyer

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    If your halide ballasts are magnetic then you can double the 150W. So add 300W to the halide figure. So in the end you will save only 340W. Now work that out over a month and then how many months you would need to run the LEDs before it pays for itself (excluding bulb changes).

    Not worth it in my opinion. But I also think that the LEDs will be brighter than the 150W halides.
     
  5. Max98

    Max98

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    I have used 44 led's total on my 150 x 90 reef. It did not cover the whole area though. It had a 15-20 cm with lower par round the edges, So I would say it covered 120 x 60 well. (You can see the par readings on my old thread)

    Something to consider into your calculation as well is 10 years of no bulb replacements as well. MH bulbs are expensive and changing 8 T5 bulbs yearly is quite an expense as well.
     
  6. LCornelius

    LCornelius Thread Starter Moderator

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    Thanks for the feedback, I will only electronic ballasts. Does this still mean 150w MH will use 300w?
     
  7. LCornelius

    LCornelius Thread Starter Moderator

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    Thanks Max, I do agree with you that LED is cheaper to run in the long run.
    I was under the impression that a LED solution uses less electricity.
     
  8. Tremayn

    Tremayn

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    they say LED saves you money over 10years but honestly no one will still be using the same LED's over 10 years. Is there anyone who has the same light unit for 10 years? I say after 3 years max you will get another light unit because you get a bigger tank or something new comes out :)
     
    Ridwaan likes this.
  9. Max98

    Max98

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    The LED unit will be far superior in light output on the amount of led's you used, so it is not really a fair comparison.

    For example, I have used 12 3w cree led's on the 60 x 60 tank of my father in law with softies, so it can be much less. That can be compared to a 150w halide.
     
    Last edited: 19 Aug 2011
  10. LCornelius

    LCornelius Thread Starter Moderator

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    So should I use less LEDs?
     
  11. pXius

    pXius

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    Yes its cheaper.

    You are comparing 150w MH lights to 240 leds. So you're comparing a bmw to a lambo

    240 leds are more powerful than 2x250w mh lights. Thats if we are talking 3W cree's

    My point is, even if the wattage is close to the same, the LED light output is way higher.
     
  12. jacoc

    jacoc

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    I have my light unit for 15 yers now...i changed to t5's 5 months ago and stil believe the old t8's unit gave betteR light...i am going to use it on a new project i'm planing...
     
  13. Elv

    Elv

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  14. Submariner

    Submariner

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    Guys you cannot compare apples to oranges.

    Take the T5 to LED comparison both units compared are of similar build quality.

    LED 480 watt LED Lighting system Dimensions 180cm long
    Lifespan of LED's +- 16 years (10 hrs per day)

    T5 unit 10 x 80 Watt T5 fixture (800 watts) 150cm long
    Lifespan of T5's +- 8 months (10 hrs per day) Globe changes in 16 years equal around 24 globe change's.

    24 globe changes x 8 globes x R250 per globe equals R48,000 (Over the LED's usable lifespan)


    Thats R48,000 in globes spent in the same amount of time that you will be just about to do your first change on your LED lighting unit.

    Add in the fact that you have been using twice the power to push the T5 unit.
    Add in all the extra power consumed by your system just keeping the tank cool.
    Add in all the extra (24 times) spent taking out the globes, replacing globes(24 times)
    Add in the cost of fuel driving to said pet shop (24 times)

    I am exhausted just talking about it :)

    Lets face facts its time to change to LED's.
     
    Last edited: 19 Aug 2011
  15. Tremayn

    Tremayn

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    how much would it cost to change LED's? :eek:
     
  16. ziyaadb

    ziyaadb

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    @mariusmeyer
    u telling me 1 150W magnetic MH pulls 300W power? so if i connect up the 3*150w that i have i will be using 900W?
    Last i remember it was like an additional 10% power usage that magnetic had over electronic so 150 used 165 max or was i told wrong
    @Falcon care to jump in here as well?
     
    Last edited by a moderator: 26 Nov 2015
  17. Tremayn

    Tremayn

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    yeah I also heard a magnetic ballast uses a little more power thats why it over drives the MH globe and looks better
     
  18. Dlaria

    Dlaria

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    What about the cost savings of not having to run chiller and fans for the led's vs the MH's/T's? :)

    Submariner caught that.

    I don't think you have to have as many blues as whites...
     
    Last edited: 19 Aug 2011
  19. LCornelius

    LCornelius Thread Starter Moderator

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    I agree with you Submariner,

    I was just under the impression that the month to month electricity cost would be cheaper.

    Thanks for all your input!
     
  20. Submariner

    Submariner

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    The month to month running costs will be much cheaper.

    Like i said factor in the fact that you will need +- 480 watts LED,s rather than 800 watts T5.
    Plus the savings on not needing to run fans, chiller etc and you are going to save.
     
    Last edited: 20 Aug 2011
  21. LCornelius

    LCornelius Thread Starter Moderator

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    Hi Submariner,

    Just to make sure I understand what you are trying to say:

    My original calculation (light unit: 2000 x 1000):

    So 3 x 150w MH and 8 x 39w T5's = 762w per hour.

    If I go LED:
    120 x 3w White LED and 120 x 3w Blue LED = 720w per hour.

    So you are saying I have way to many LED's?
    What would a better ratio be? 160 LED's give me 480w per hour.
     
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