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  1. #1

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    LED what bin ?

    hello

    i plan to use the cree xm-l leds for my scrubbers.

    i take it i want to find and mix the leds on both sides of the 2700k line?

    please see page 7
    http://www.cree.com/products/pdf/XLampXM_B&L.pdf

    under warm and white

    thanks

  2. #2
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    You are looking for the ones that are about 660nm.
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    As Kerry said. You'll want 630-660 NM Red/Deep Red LEDs.

    I personally use ten 660 NM Osram brand LEDs on one side and 100 watts CFL @ 2300K on the other. It's not even a fair comparison. The LEDs grow greener, faster, and more algae.

    "White" light is wasted as algae doesn't even see that spectrum.

    the cheap Chinease LEDs work too from what I hear. But I don't want to support their black market.

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    Quote Originally Posted by kerry View Post
    You are looking for the ones that are about 660nm.
    yeah the dont list nm on there just jsut K and those other number does anyone know how to convert them?

    please looks at the document the "bin" the leds, what bin is your LED from that are 660nm ? can you look at the number that you ordered? that document shoes where to look

  5. #5
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    Quote Originally Posted by turbo v6 camaro View Post
    yeah the dont list nm on there just jsut K and those other number does anyone know how to convert them?

    please looks at the document the "bin" the leds, what bin is your LED from that are 660nm ? can you look at the number that you ordered? that document shoes where to look
    These are red and are not rated in the "K" scale. Mine are just plain old 660nm (nanometers). This is just like a color that you would see when a light source say of 6500K is refracted through a prism. The prism refracts a light pattern like a rainbow, my LED's are in the red spectrum that is displayed through the prism. Check this site it might help a bit. http://www2.chemistry.msu.edu/facult...s/spectrum.htm . Just google "660nm 3W LED" and a lot of places will come up in your search.
    150G. Reef/Mix
    125G. 3 Regular Oscars/1 Jack Dempsey
    75G. 20+ Africans
    40G. Fish/Reef. Algae Scrubbers on ALL my SW
    10G. SW Fish/Reef.
    10G. SW Hospital/new fish quarantine/pod breeder tank
    6 stage RO/DI system 200 GPD.

  6. #6

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    Quote Originally Posted by kerry View Post
    These are red and are not rated in the "K" scale. Mine are just plain old 660nm (nanometers). This is just like a color that you would see when a light source say of 6500K is refracted through a prism. The prism refracts a light pattern like a rainbow, my LED's are in the red spectrum that is displayed through the prism. Check this site it might help a bit. http://www2.chemistry.msu.edu/facult...s/spectrum.htm . Just google "660nm 3W LED" and a lot of places will come up in your search.
    i'm using the XML's becuase they are the most ligh for the watts. and becuase really cant any other stuff I found some 10w an 5w reds but thos gota be tro strong.

    the old cree's seem like they waste lots of power for the light you get.

    http://www.mouser.com/Search/Refine.aspx?Keyword=660nm

    i hope that works, there are a few options there

    like
    [LedEngin LZ4-40R200]

    897-LZ440R200

    LZ4-40R200
    LedEngin High Power LEDs - Single Color Deep Red 660nm Data Sheet 75
    In Stock
    More Info Available

    ^ thata 10w led (really 7.5: 700ma at 10.5 volts)

    but i have not heard of these before

    http://www.mouser.com/ProductDetail/...HvczxJuGP5FfBw

    that one claim 5W but its on 2.5v @ 1amp = 2.5W

    my question is, what xm-l BIN is the in the 660nm area? it should be around the 2700K area. I know one is really "light temp" and once is wave length.

    one of those bins for xml have to be close (see the warm chart in page 7 on my first link above) i have found the xm-l for 5-8$ each on website around the net.

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    Quote Originally Posted by turbo v6 camaro View Post
    my question is, what xm-l BIN is the in the 660nm area? it should be around the 2700K area. I know one is really "light temp" and once is wave length.

    one of those bins for xml have to be close (see the warm chart in page 7 on my first link above) i have found the xm-l for 5-8$ each on website around the net.
    The answer to your question is none. There are no white LEDs that put out any large amounts of 660nm light. They all drop off in spectrum before they hit 660nm, even warm white LEDs. It doesn't matter how many watts, lumens, or PAR output a white LED puts out, bottom line is at least 75% of the light that is emitted from a white light source is going to be wasted light, in turn being wasted electricity, when trying to grow algae. You would get much more growth using 1/5th the wattage and using the correct spectrum (1w 660nm LED vs a 5w Cree XM-L).

    These are the most recent LEDs I ordered. I got both 640-650nm and 650-660nm. Price was $1.80ea. They are from China though, so you have to deal with everything that comes with that (language barriers, lack of support, having to order 100 pieces minimum, etc).
    http://www.fd-led.com/productinfo.php?id=108

    For smaller orders I stick with RapidLED and go with the OSRAM 660nm LEDs which are high quality. Great place to buy from IF you live in the states.
    http://www.rapidled.com/servlet/the-...-3W-Red/Detail

  8. #8

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    Still unsure about the watt's LED per cm2..
    anyone to answer that?

  9. #9
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    As far as LED per cm2.. I would say from my experience that 1 LED (3w style, running at 2w) can cover an area up to 4 cm2 but ideally you would want to stay under 3 cm2. That is my guesstimate on what red LEDs will cover and still give you good growth.

  10. #10

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    Distance from screen has to be factored in as well. I am currently @ ~3" distance. We should start a thread about this to pool user experience and best practices, e.g. what works and doesn't.

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