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Thread: Red Wavelength Choice

  1. #1
    Join Date
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    Default Red Wavelength Choice

    Ok guys, working on my projector build & currently sorting the red.

    Which do you think would be better? Beam visibility is important more than graphics.

    Straight 2.8W of 660 ( prob 2.4W after optics )
    Straight 1.6W of 637 ( approx 1.4W )
    Mix 2.2W of 660 & 637?

    Some other mix....???? include 642???? I have 8 diodes to play with.

    Cost is a factor so is it worth starting with 660 & upgrading as funds & experience allow or is it pointless? Would it be a good idea to get all working / built on 660 then upgrade?

    Thanks
    Last edited by dilbert; 05-09-2011 at 07:48.

  2. #2
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    Default

    im sure lots of people will now post 660 is crap bla bla bla... heard it so many times.

    but very cheaper, just as good beam as 640 and 637, but yes its a little darker than 640 and 637.


    a few watts of 660 for low or for 640 or 637
    Eat Sleep Lase Repeat

  3. #3
    Join Date
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    Lightbulb

    I love 660 for the deep red and larger color gambit; if you can build a 660 rig with enough power to match you other colors, I say go with 660.
    Love, peace, and grease,

    allthat... aka: aaron@pangolin

  4. #4
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    Default

    I think the question is beams or graphics?

    2.4W of 660 is going to be significantly dimmer than 1.6W of 637

  5. #5
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    veenwouden
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    Default

    I would go for a mix. That way you save money and still have allot of red. Also because of the broadband red you get beautiful colours

  6. #6
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    Default

    yes multiple lines is always nice

  7. #7
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    Default

    Quote Originally Posted by flecom View Post
    I think the question is beams or graphics?

    2.4W of 660 is going to be significantly dimmer than 1.6W of 637
    indeed it would but 660 would cost you where as 673 will cost you
    Last edited by andy_con; 05-09-2011 at 14:49.
    Eat Sleep Lase Repeat

  8. #8
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    Default

    Quote Originally Posted by andy_con View Post
    indeed it would buy 660 would cost you where as 673 will cost you
    lol indeed, what a great summary of the whole dilemma...

    you have do decide how many dollar (pound?) signs its worth to you!

  9. #9
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    Quote Originally Posted by flecom View Post
    lol indeed, what a great summary of the whole dilemma...

    you have do decide how many dollar (pound?) signs its worth to you!

    indeed and until the price of a 640 or 637 diode comes down im sticking with 660 as i can get just as good a beam
    Eat Sleep Lase Repeat

  10. #10
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    Default

    My 2c...

    It all depends on the size of your blue and green really, and of course how large a space you're intending to light.

    I have a small projector with around 300mW of 660nm which is fine for a smallish room, pub etc. I have to pull the 150mW green and blue down to about 100mW each to get a good white balance.

    I have a larger projector with 1W of 635nm and about 500mW of green and blue each and I have a little too much red without pulling that back to about 750 - 800 mW. But that's too big to use in a pub (without beam attenuation maps etc) and needs a larger club sized room.

    If you're keen on beams and not graphics like me, there's no point in spanking up the power only to have to cut it back because the thing is just too damn retina burning bright! So think about where it will be used, choose your green and blue sizes accordingly and then x1 to 1.5 for 637 to 640nm or x3 for 660nm (or somewhere in between with a mix).

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