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High power LED lighting

Discussion in 'LEDs and Optoelectronics' started by igonine, Mar 4, 2013.

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  1. igonine

    igonine

    1
    0
    Mar 4, 2013
    Hi:

    I'm building a aquarium lighting with 1w LEDs, and my main question is what circuit is the best and most safe way to control the LEDs??

    I am considering the circuit as in the image attached.

    What do you guys think?

    Thanks
     

    Attached Files:

  2. (*steve*)

    (*steve*) ¡sǝpodᴉʇuɐ ǝɥʇ ɹɐǝɥd Moderator

    25,411
    2,779
    Jan 21, 2010
    That will work, but you want to ensure that the constant current circuit has maybe 4 volts across it. Any less and you'll get poor current regulation. Any more and you'll get a lot of heat dissipated.

    You may need a little more voltage because Q1 is a darlington,

    edit 3 to 6V across it will be fine. You can have more if you're not too worried about the heat. There are switchmode regulators that can do this without the heat. If you use this, heatsink Q1 appropriately.
     
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