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For the moment i dont think this is possible hope they will fix this soon i want that setting to

a small trick that works with some light is to make your Emmiter plane just 1 face (quad or tiangle) and then just scale it really small, Iv noticed that a emmiter plane of scal .01 or even .001 isnt visible to my camera, and still emmites alot of light , you can pump the power up , and wen an emiiter is that small it emits as a psudo Omni light, if you need a less of the Omni light , you can always take a plane and scal its x so that its 10 or 50 units loing but scal the Y so its .001, then you have a long , invisible psudo florecent light.

Its not as great as being able to turn on visiblity of a light byut lights at supers small scales emmit amazing amount of light while the light sours remainss "invisible to the camera"

hope this helps, untill they update maxwell and mayall

-Luke

...but shadows are so sharp with this trick.

Excellant, I had the same problem. I wonder if you used multiple small quads would it give less sharp shadows... almost like an area light?