question in Ballast (13)

Follow

Yanrong Gao

June 24, 2021 00:18

Hi Guys, I don't understand the highlighted sentence in below image. I hope someone can explain it for me. Thanks very much in advance.

0

• 

  Rebekka O'Melia July 14, 2021 18:01

  I think this website is helpful for visualizing the cutoff angles.   https://www.erco.com/en/guide/designing-with-light/luminaire-arrangement-2204/

  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

  0

  Comment actions Permalink

Please sign in to leave a comment.