If you need the light output to not be impeded but you don't want the audience to be able to see the bright lens of the light, louvers can be the answer. If you look exactly directly into the light you will still see the light but if you are at an angle at all the louver begins to block that light from your sight. This is very helpful to designers who care about "Contrast Equals Interest". Lets keep the eye on the performer, not the lighting grid. - Louie Lumen

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