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light beams affect each other?

Discussion in 'Landscape Lighting' started by starry night, Apr 23, 2012.

  1. starry night

    starry night LawnSite Silver Member
    Posts: 2,744

    What happens when two beams of light cross? Do they continue on as they would without a crossing beam? Do they diffuse? Does any light get re-directed into the (?) area in this drawing. Dotted line is one beam; the solid line is another beam.

    light beams.jpg
  2. knox gsl

    knox gsl LawnSite Fanatic
    Posts: 5,058

    I don't think it makes a difference, I've done alot of work around stage lighting and that is common there, I've also seen projectors cross beams and work.
  3. Green Acres Indy

    Green Acres Indy LawnSite Member
    Posts: 15

    That's only a problem if you are a ghostbuster using a proton pack. "Never cross the streams!"
  4. steveparrott

    steveparrott Sponsor
    Posts: 1,196

    No affect to either beam. If both beams overlap over a surface, however, it gets more interesting. The illuminance (footcandles) is directly additive. The reflected luminance (the light that reflects back to your eyes), on the other hand, depends on the reflectance and specular nature of the surface - lights coming from different angles will yield a complex visual experience that will vary in brightness depending on the visual angle.

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