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Luminance Units

supernoobsupernoob Posts: 154
in New Users

I've lost the 'Luminance Units' option, can someone please point me in the right direction?

Does it only appear on certain types of lights? I would have thought it would be with all the other light-related options.

Thanks

Comments

  • BradCarstenBradCarsten Posts: 856

    Make sure you have the iray engine selected under render options. You need that in order for the iray options to show up under the lighting parameters. 

  • Richard HaseltineRichard Haseltine Posts: 100,468

    Is your render engine set to Iray? Is the Photometric button set to On for the light?

  • supernoobsupernoob Posts: 154
    Richard Haseltine said:

    Is your render engine set to Iray? Is the Photometric button set to On for the light?

     

    Render engine is set to iray, photometric is on.

    Where is the luminance unit option supposed to appear?

  • RobinsonRobinson Posts: 751
    edited August 2017

    It's Luminous Flux (Lumen), usually on Light -> Photometrics page of Parameters for the light.  If you hid it by mistake, click the 4 bar menu on the parameters page and "Show Hidden Properties".  You can then unhide it.

     

    Edit, duh.  You want Luminance Units, not Flux.

    Post edited by Robinson on
  • rames44rames44 Posts: 329

    On my system, at least, I only get lumens for spotlights. On mesh lights (i.e. objects that have been set to use an emissive shader) I get the units. I would have thought that the units would have been present on spotlights that are not "point" geometry. But then, I didn't design the program...

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