help with lighting effect tool

[nanik]

When I use lighting effect tool especially 2 o'clock spotlight option I always get horizontal stripes in the image (10ish). Stripes are tiny but visible especially when zooming in. It does no matter what I do stripes always show up together with lighting effect. Surely these are not supposed to be there?
So questions is what am I doing wrong? Is one setting incorrect somewhere (not that I change anything to get the stripes)
So appreciated of any and all help!

[Gaussian]

What resolution is the image you are working on? Do you see the banding problem in your Photoshop PSD or is it only after you save the file as a JPG, GIF, PNG or other format?

[nanik]

Tried use effect with raw, jpeg, pds files, no difference always get lines over image.

[Steve]

I just tried it and had no problem.
You need to post an example.
Steve

[iDad]

Im thinking a layer mode is set for the layer in question or another layer that's causing it

[nanik]

I cant send example because I dont have enough posts!? no links allowed.

It does not matter what the original file is it still does this., jpeg, raw... I just tried with jpeg pic and only did lighting effect 2o'clock , nothing else - no change in layer setting etc. And got horizontal lines in pic.
3872x2592 pixels, resolution 240dpi