question in Ballast (13)


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    Rebekka O'Melia

    I think this website is helpful for visualizing the cutoff angles.

    The same light fixture with different cut-off angles, is going to have different curves. The lower the angle (angle a°) the more spread out the light is. 

    A 90° angle would be straight down. 

    Due to their narrow light distribution, downlights with a 50° cut-off angle achieve very a high visual comfort for high rooms.

    With a low cut-off angle (like 30°) the circles of light are going to overlap, which could cause glare.

    Hope this helps!

    Rebekka O'Melia, B.Arch, M. Ed, Registered Architect, NCARB, Step UP ARE 5.0

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