Getting photometric Lights to emit in positive Z direction

[helloVPV7X]

Hello,
I'm having a problem with photometric lights. The problem is that the light only emits on positive Z axis, and everything is black on the negative Z axis like there is a plane blocking the light. Well, this is not what happens in the real world, some lights spread in both directions and I'm using a ies file that spreads in both directions (it works in Vray). Anyway, the real world light spreads all over regardless it is a spot or an omni. Is there some parameter I'm not aware, or not using?

Thank you

[Shawn_Kearney1]

Are you sure this isnt your ies file? A lot of times they do behave this way in order to model the fixture. I think Phillips and Sylvania has some bare bulb models.

[helloVPV7X]

I've tried different ies files, including philips and ones that are supposed to simulate wall fixtures that spread light upwards and downwards. Still there is no light bleeding above the light position, it realy looks like a plane is blocking the light as the picture attatched. Please notice the horizontal line, it is coincident with the top coordinate of the light.

[Stephen.Blair]

Can you post one of these IES files?