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Duration of blinking light cycle

Hi Everybody,
I am busy for quite a while building lighthouses for placement around Ireland. Not only the building itself, but I also want to add the lightcharacteristics to the lighthouse. However I am encountering a strange problem now which is: I have made a lightfx in FXEditor and as a result the light blinks 2 times during a cycle of 5 seconds. That is how it should be. I have added this fx to my model with MCX and placed it with the Wizard on the right spot.

After that I open P3Dv3 (my FS) and go to the runway of Inishmore, from where I should be able to see the lighthouse. An yes, it is there and blinking. But the strange thing is that in P3D the double blinking has a cycle of about 15 seconds. So the light blinks twice every 15 seconds, while FXEditor shows the same effect blinking twice every 5 seconds. What is going on ?? Why is the effectbehaviour in FXEditor and P3D not the same and how can I get the timing right in P3d ?

I have been discussing this matter with Mindstorm and we have not been able to solve the probleem.

Thanks for any help.
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Maybe I have not been specific enough in my asking: I see that over 40 people have seen this post, but no one reacted up to now.

My only question is how to shorten the cycle time of the effect in P3D form 15 secs to 5 secs ?
I hope that there is someone who can answer this question.... :scratchch