Understanding LED lighting for a reef

Discussion in 'Lighting' started by Tridan, 20 Oct 2011.

  1. Tridan

    Tridan

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    OK so i have a million tabs open on my laptop right now trying to figure out the whole led lighting scenario and how it all mashes up.

    In this thread started by @mandarinman , @Submariner states that anything under 80 lumens per watt is not worth looking at, when you take that metal halide ranges from 65 to 115 lumens per watt, i agree with this statement.

    Then you look at @fly* cube and he has the par38 bulb from General lamp if this is the same that fly is using its total lumens are 1550 all cool white led, divide that by 12 ( the amount of led ) then divide by 3 ( the wattage of each diode ) then these units work out to 43.05557 lumens per watt, a bit low in the lumens acording to the above statement from Submariner, but they seem to be working fine for him. So with that in mind what is the general consensus with regards to LED and lumens per watt.

    Then i found this on wiki

    High-Brightness (HB) LEDs

    The Cree XLamp XP-E is a white LED mounted on a 3.5 by 3.5 mm base with a maximum drive current of 700 mA and a wide viewing angle of 115 degrees. It is available in Cool White (87.4 - 114 lumens at 350 mA), Neutral White (80.6 - 100 lumens), and Warm White (67.2 - 87.4 lumens). The typical forward voltage drop is 3.2-3.4 volts.[10]
    All XLamp LED production units are sorted into a number of coded bins, based on color and brightness. Due to the power level and heat generated, adequate cooling is key to good usage of these parts.[11]
    The XLamp XR-E is a white, blue or green LED mounted on a 7 by 9 mm base with a maximum drive current of 700-1000 mA and a viewing angle of 90-100 degrees, rated for 50,000 hours. It is available in Cool White (80.6 - 107 lumens at 350 mA), Neutral White (62.0 - 93.9 lumens), and Warm White (56.8 - 80.6 lumens); Royal Blue (300 - 425 mW), Blue (23.5 - 30.6 lumens) and Green (67.2 lumens). The typical forward voltage drop is 3.3-3.7 volts.[12][13]
    Newer additions are XLamp MC-E[14] which are basically 4 XR-Es (individually addressable) in one package, able to produce up to 370-430 lm together when driven at 4x350 mA.[15]
    More recently, Cree has released the X-Lamp XM-L Cool White LED. This LED emits 1000 lumens at just under 10 watts.
    The company has received a contract to provide energy efficient LED lighting to Walmart for new stores and renovations in November 2009.[[ame="http://en.wikipedia.org/wiki/Wikipedia:Citation_needed"]Wikipedia:Citation needed - Wikipedia, the free encyclopedia[/ame]]


    I also found this on luminous efficiency also from wiki, might be a bit old tho


    [ame="http://en.wikipedia.org/wiki/Luminous_efficacy"]Luminous efficacy - Wikipedia, the free encyclopedia[/ame]




    The x range from cree seem to be the right diode for reef tanks, but what other diode's are available to us that fall in to the right lumens per watt category.
     
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  3. mandarinman

    mandarinman

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    i see the bug has bitten. now you know why i am excited about my leds
     
  4. dallasg

    dallasg Moderator MASA Contributor

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    i must admit that it was cheaper for me to stay with T5 then go LED, let me find that calc i did
     
  5. dallasg

    dallasg Moderator MASA Contributor

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    Are LED's really cheaper
    i have 8 x 54w T5 giesemann globes and according to their website the globes last 18-24months so lets take 18months
    now 5 yrs is 60 months and divided by 18 i need 3 changes., my combination of globes cost me R2500 a change so thats R7500 for 5 years which is R125 a month.
    the constants are R300 service fee to city power so i will leave it out, i have no chiller so heat costs arent needed eighter
    now the kWh price is about 85c and my unit is 432watts and the equiv LED unit is 120watts, i run them for 10 hours a day, 30 days to a month
    so T5 = (0.432*0.85)*10*30 = R111
    and LED is (0.120*0.85)*10*30 = R31

    unit cost T5 = R5000, over 60 months = R84 + bulb cost R125 = R209
    LED *Brand* = R20 000 - price i have gotten, over 60 months = R334

    T5 Total monthly cost is R320
    LED Total monthly cost is R365

    ok so its more expensive for LED after reworking based on buying a LED unit here in SA for a 1200x800x500 tank
     
  6. Tridan

    Tridan Thread Starter

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    I have just got a price on lamps similar to fly's and they work out at a rather good price
    The diode's are the cree xp-e and work out ex shipping at about $45 for the 12 diode and $40 for the 9 diode.

    Thing is are these good enough to use for a glass box
     
  7. Tridan

    Tridan Thread Starter

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    Am i right or am i reading your sum wrong?
    Thank dallas
     
  8. dallasg

    dallasg Moderator MASA Contributor

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    they should be, what is the optic angle?
     
  9. dallasg

    dallasg Moderator MASA Contributor

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    it cost me R5000 with the globes, i then would change to gieseman at the first change
     
  10. Tridan

    Tridan Thread Starter

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    up to 120 degrees
     
  11. Tridan

    Tridan Thread Starter

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    Ok cool i see, thanks
     
  12. leslie hempel

    leslie hempel Moderator MASA Contributor

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    have you added 12 monthy bulb replacements to this equation?

    ...and remember that dependant on LED type (brand) some manufacturers are claiming 10 year lifespan?
     
  13. dallasg

    dallasg Moderator MASA Contributor

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    i worked on 18months as gieseman say they last that long, i am playing devils advocate

    i did work on 10 years to start but who uses their light unit for 10 years

    i can re-do it for 10yrs
     
  14. dallasg

    dallasg Moderator MASA Contributor

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    i have 8 x 54w T5 giesemann globes and according to their website the globes last 18-24months so lets take 18months
    now 10 yrs is 120 months and divided by 18 i need 7 changes., my combination of globes cost me R2500 a change so thats R17500 for 10 years which is R146 a month.

    now the kWh price is about 85c and my unit is 432watts and the equiv LED unit is 120watts, i run them for 10 hours a day, 30 days to a month
    so T5 = (0.432*0.85)*10*30 = R111
    and LED is (0.120*0.85)*10*30 = R31

    unit cost T5 = R5000, over 120 months = R42 + bulb cost R146 = R188
    LED *Brand* = R20 000 - price i have gotten, over 120 months = R167

    T5 Total monthly cost is R299
    LED Total monthly cost is R198

    so if you keep it for 10yrs you save R100 a month, which is a total saving of R12k
     
  15. Tridan

    Tridan Thread Starter

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    Ok based on dallas's sums with regards to electricity consumption,

    T5 lighting would consume R1340.28 ( 0.432 X 0.85 ) x 10 x 365 ( 1 year )
    LED would consume R372.30 ( 0.120 x 0.85 ) x 10 x 365 ( 1 year )

    Multiply them by 5 years each
    T5 cost electricity would be R6701.40
    LED cost electricity would be R1861.50

    Difference of R4839.90 over 5 years just in electricity usage

    The initial outlay is what burst the bubble tho, pity.
     
  16. dallasg

    dallasg Moderator MASA Contributor

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    yip, but i reackon in a year or 2 it will be cheaper, now even plasma is working out better
     
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  17. Tridan

    Tridan Thread Starter

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    I reckon you spot on there dallas,
    Thanks for your input
     
  18. Elrond

    Elrond

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    Multiply them by 5 years each
    T5 cost electricity would be R6701.40
    LED cost electricity would be R1861.50

    Difference of R4839.90 over 5 years just in electricity usage

    You're assuming electricity prices won't double every 2 years like they have been for the last few. Over 5 years I reckon your electricity saved will be closer to R10k on electricity alone.
     
  19. leslie hempel

    leslie hempel Moderator MASA Contributor

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    very good point, you can add on roughly 32% per year for the next 5 years :lol:
     
  20. Jcc

    Jcc

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    And the initial price for led unit would not be as high as 20 000. You can order units online for a lot less. You looking at 10 000
     
  21. Tridan

    Tridan Thread Starter

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    Yip you are right Elrond but i honestly cant factor in eskom realistically as you say they could double the price in 2 years or even triple it.

    One thing i have been looking at is completely going of the grid with regards to lighting, the use of a solar panel and deep cycle batteries, it is very attainable with led consuming very little power. but now my brain needs a rest
     
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