LED "cannon" - I wish I was rich...

Discussion in 'Lighting' started by Dane, 31 Jan 2011.

  1. Dane

    Dane

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  3. seank

    seank

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    These are the ones I've been waiting for since last year. Scuba, where are you??????
     
  4. Max98

    Max98

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    The only downside I can see is that the LED used only pushes 75 lm/w.

    Quote from the edison-opto website:
    " luminous flux output up to 7,500lm for 100W"

    The 3w cree xp-g gives 139 lm/w.
     
  5. RiaanP

    RiaanP Moderator

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    $549
    for one..... YIKES

    I just got a cramp where I do not want one.
    yeah, that is dollar...
     
  6. archiecrain

    archiecrain

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    Those are awesome looking......but as Riaan said.....YIKES....

    How do you justify that sort of price premium over conventional lighting?
     
  7. Max98

    Max98

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  8. inflames

    inflames

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    Thats really not a bad price, once converted R3500 odd, for 50 000 hours. Thats 17 years at 8 hours a day, give or take... Do the math..R800 for a 150 watt Metal Halide lamp every year, thats R13 600 odd (not even taking inflation into account!) You would be at least R10 000 richer in 17 years time, not to metion the saving on electri bill!;) This is one one globe, most reefers have at least 2 metal halides!!!!
     
  9. RiaanP

    RiaanP Moderator

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    But look again.
    This looks like a 1.2, Might even be smaller, picture is deceiving.
    [​IMG]
    And there are 4 units.
    So 14K for lights on a 1.2.

    How in the world can I confince the non-reefer that in 17 years we would be richer? I will not even get the budget now to buy this.

    And they are 50W a unit, same as T5, so where is the monthly electricity saving????

    Some other maths.
    50000 hours, that is 5.7 years. At 80% lifetime its 4.5 years. So about 5 years on a globe. cool.

    T5 * 4 replaced 2 times a year total for 5 years, 40 tubes. At Gieseman, 240- 360 a tube, lets take avg R300, that is R12000. Plus light unit, 2-3K. Total 14 to 15K
    So the SAME, where is the saving? Not even the same, import tax and LFS profit not even taken into account yet, so at least double up on that $549.

    And I seriously doubt, if those units will last 50000H. That is a prediction
    And I wonder, if they would have the same issues as T5 and MH where the globe intensity reduces over time, forcing us to replace it. Even have to replace the CFL on your scrubber like every couple of months. Most likely.
     
  10. Tremayn

    Tremayn

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    Cool but too expensive. Rather make a pendant out of a car HID kit because they are also projectors and are 1k for two lights... End of the day it would be better to just go for T5 lighting because of the costs.. Or go FWLR :p .. no lights then ;)
     
  11. Max98

    Max98

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    Riaan, I agree with you on these, but it is not on LED's in general.
    These are very expensive and not very efficient.

    But the cree 3w LED's are another story.

    First the xp-g led has an efficiency of 139 lm/w against the 75 lm/w of this unit.

    Cree states 70% of the original light output at 50 000 hours as long as you don't overdrive them.

    50 000 hours is only 5 years if you have them on 24/7. But it is over 10 years for a normal reef keeper that has his lights on for 10 hours a day.

    My DIY led pendants cost me about R7000 for the whole reef(Not in use yet, but soon)

    So in this instance it is quite a saving in the end.
     
  12. RiaanP

    RiaanP Moderator

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    Cree is different. Agreed.

    70% at 50000 hours. Did not know that, and that is what bothered me. So it would be safe to suggest replacing LEDS at about 80% of 50000 hours.

    24/7, oops, my mistake. Yip agreed. But still needs to convince the minister of finance...
     
  13. Max98

    Max98

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    At 80% you are still over 10 years if you run your lights 10 hours per day. :)
     
  14. Q89

    Q89

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    Wow those are just beautiful, but the price is not that nice:p
     
  15. RiaanP

    RiaanP Moderator

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    ok, so t5 needed in 10 year, on a 1.2 example, 4 tube unit, 80 tubes. At R300 that is R24000. But it is not a once off expenditure.

    And at todays exchange rate, that $549 is R3941.31.
    4 units is R15765.24
    Double that up for import and LFS profit and we end up at R30K So that is still more than T5.

    But so nice, but ... yeah, no way I can part with about 30K in one month on my tank.
     
  16. inflames

    inflames

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    Hi Riaan,

    Do you think it possible to run a Full Reef off just 4 T5 tubes? I think that it might be possible, but probably not optimum! I would say that a full reef would require double the amount of T5's that you are suggesting. So double up your cost!

    Also you have no inflation linked to your calculation. R300 in 10 years time is over R700 @10% inflation. 80 tubes with inflation over a 10 year period is R38 249 (@10% inflation). Still a saving of R10 000 odd over the same period. Sure the electricity might be about the same cost though!

    So the maths works out much in the favour of the LED's, but like you say, to part with that amount of cash once off is hectic!

    I am also of the opinion that LED's are still quiet expensive initially because its the "new" craze. give it a few years to come down in price (once the Chinese start making them for next to nothing) will be well worth it!
     
  17. Max98

    Max98

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    Running these 4 led tubes is the same as running 4 x T5 tubes since this specific LED is not energy efficient at all.

    As far as I have seen T5 puts out almost the same. 75 lm/w. (Differs per T5 tube)

    The Cree xp-g that puts out 139 lm/w allowes you to have less watt's over your reef, but it is not the case with these 50w led's.
     
    Last edited: 1 Feb 2011
  18. RiaanP

    RiaanP Moderator

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    that pic, max I reckon it is a 1.2, more likely a 1m by .5, .5

    So 4 T5, yes.

    And I take the current cost of both setups. I have to put 30K into that LED unit on date of purchase. And the total cost on T5, in terms of today cost

    Yes agree, but cost of T5 tubes must also be taken into account over time. It will come done as more Chinese are able to compete with Gieseman in terms of quality. So yes, two unknown values, inflation and unit price (fixed/raising/dropping). So on that, I take the current value as some point that at least is fixed.

    Also as LEDs take off, then surely T5 tube prices will drop.

    But yes, currently LEDS are the future. but for today, my wallet is not thick enough.
     
  19. clinton stanford

    clinton stanford

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    wow!...very awesome! but lots of $$$.
     
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