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Thread: Color modulation question

  1. #21
    Join Date
    Jan 2006
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    Charleston, SC
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    Quote Originally Posted by Vectorfire View Post
    That makes sense. The ILDA website is trying to ensure that promoters don't sign off on an under-powered show that will look lame. In the other thread you started, I also assumed you were thinking about a commercial show, which is why I initially recommended higher powered lasers. But for home use, it's just not an issue because you can always control both the light level and the fog with great precision.

    How does one quantify beam quality?
    As a general rule, you look at beam diameter and divergence. Lower is better in both cases.

    A typical 2 watt projector will have a 3 to 4 mm beam at the aperture and roughly 1 mrad divergence. Anything over 1.4 mrad is a sign of poor quality, as would a beam diameter larger than 4.5 mm (at least for this power level). Some higher-quality units might have tighter beams.

    Adam

  2. #22
    Join Date
    Dec 2009
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    Laurel, MD
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    325

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    Quote Originally Posted by buffo View Post
    A typical 2 watt projector will have a 3 to 4 mm beam at the aperture and roughly 1 mrad divergence. Anything over 1.4 mrad is a sign of poor quality, as would a beam diameter larger than 4.5 mm (at least for this power level).
    Not necessarily I don't think. It's not uncommon for lower powered aerial projectors to intentionally have higher divergence. 1.5-2mrad would not be ideal 500 feet out, but if your maximum throw in a club is 200 feet the thicker, higher divergence beam catches more haze.

    Also it's common practice now with higher powered gear to go for larger beam diameter, lower divergence for a longer throw, so you may see something like 1mrad on a 40 watt projector, but with an 8-10mm beam

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