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Creating false ceiling. The circular light having the ies lights, Same material used to the rectangular light. Why there is no emission on the rectangular panel. I have check the rectangular panel are assign with the led material. Any suggestion or help why no emission. Thanks

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  • $\begingroup$ Which Blender version do you use? (And why got this question 2 downvotes?) I've opened the file in Blender 2.91.2 and the rectangles look white like the round areas. Might be a bug? $\endgroup$
    – Blunder
    Feb 20, 2021 at 22:24
  • $\begingroup$ @Blunder 2.91.2. no lights for me $\endgroup$
    – atek
    Feb 21, 2021 at 3:19
  • $\begingroup$ That's strange. I've tried with Blender 2.9.0 on another PC (Win) and it looks fine to me: i.stack.imgur.com/LY3ex.gif (material preview top/bottom + render preview top/bottom) $\endgroup$
    – Blunder
    Feb 21, 2021 at 11:24

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It looks to me like the light is emitting light, but since it is completely flat against the ceiling, no rays go sideways. I recommend making the lights slightly spherical if they are not. If they are already spherical, check the normals of the ceiling.

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