LED Light Interferance

[danletkeman]

I picked up an EmpireTech 4K Full-Color Ultra Low Light 8MP. Outstanding camera. Outdoor picture quality is awesome and the web interface is a step up from what I have been using. I was doing some test shots indoors and I noticed that when I had it in areas where there was LED light fixtures such as a 4' long 6 bulb fixture or even some new 2x4 ceiling flat panels, there were large horizontal scrolling lines showing up in the image. I didn't find too many posts about this, and I have only tested this camera in this building. Is there a particular setting that should mitigate this problem?

 

[wittaj]

You need to find a shutter speed that isn't the same phase as the LED. So try an odd shutter speed and see if it helps. It does outdoors so I would think it would indoors

 

[looktall]

Do these cameras have an anti flicker setting?

The setting you want is below the red box.

https://dahuawiki.com/images/e/eb/Encodesettingswiki6.png

 

[danletkeman]

Interesting. I will check it out next week.

 

[wittaj]

The problem with the anti-flicker option is it also then eliminates some parameters that you can set as it forces the camera to not allow the user to change a parameter that can bring it back.

Anti-flicker does not allow a shutter speed faster than 1/100, nor does it allow the user to give the shutter speed a range, and does not allow a user to turn on WDR. It may take away others as well, but I know those two for sure.

The problem can be solved with a shutter speed adjustment, which is what I recommend so that a user maintains full ability to adjust camera parameters.

You want to stay off shutters that are whole number divisible by 50 or 60 (depending if you are in a 50 or 60hz area). So you try and odd shutter speed like 1/87 (11.49ms) or 1/66 (15.15ms), etc.

 

[CCTVCam]

I'm on 50hz and have seen no banding from shutter speeds of 125 or 250th. I allow the camera to range so it could be setting others, but have had no issues.

 

[danletkeman]

The problem with the anti-flicker option is it also then eliminates some parameters that you can set as it forces the camera to not allow the user to change a parameter that can bring it back.

Anti-flicker does not allow a shutter speed faster than 1/100, nor does it allow the user to give the shutter speed a range, and does not allow a user to turn on WDR. It may take away others as well, but I know those two for sure.

The problem can be solved with a shutter speed adjustment, which is what I recommend so that a user maintains full ability to adjust camera parameters.

You want to stay off shutters that are divisible by 50 or 60. So you try and odd shutter speed like 1/87 (11.49ms) or 1/66 (15.15ms), etc.

Got it. I definitely want WDR on.

 

[biggen]

Canada is a 60hz system right? If those rolling bands are really from lighting, then you will be limited to shutter settings of factors of 120. So 1/120, 1/60, 1/30, etc… Here is my post talking about it and the camera: Help tweaking 4K-T

Here is a website that goes into details about it:Avoid Video Flicker: Understanding PAL (50Hz) & NTSC (60Hz)