photoshop lighting effect issue

@powelly90 reported faint lines appearing after applying the Lighting Effects filter. That symptom is usually an artifact of the image data or the filter’s processing, not the monitor itself. As @DriftingSteps suggested, a 100% screenshot and a flattened, lossless export are the quickest way to tell whether the lines are baked into the pixels or only visible in the preview.

Common root causes and quick checks:

• Banding/posterization from low bit depth or heavy compression (JPEG) — gradients become stepped and lighting filters amplify those steps.
• The filter sampling the image as a bump/texture map — small repeated compression lines or channel artefacts can be emphasized.
• Layer masks, alpha channels, transparent areas or partially rasterized layers that create edges the filter follows.
• GPU/display driver or preview-rendering bugs that show lines only on-screen.

Practical diagnostic steps:

• View at 100% and at several zoom levels to see whether lines scale with zoom.
• Flatten a copy and apply Lighting Effects to the flattened copy. If the lines disappear, the problem is layer/channel related.
• Save a flattened, lossless file (PNG or TIFF) and open it in another viewer. Persistent lines in the exported file mean they’re in the image data.
• Check color mode and channels (RGB vs indexed), and remove any unused alpha/channel data the filter might be reading.
• Reduce or disable the texture/bump strength in the Lighting Effects settings, or use a neutral 50% gray bump to test.
• If banding is the issue, add a small amount of noise (0.5–2%) to the affected layer to break up visible steps.
• Update graphics drivers and try the same file on another machine or a different Photoshop/Elements version to rule out a software bug.

The suggestions from @gargmanu123 and @stonemethew about monitor resolution affect display scaling only; they will not remove artifacts that are actually in the image file. If exported files still show the lines, collect the Photoshop Elements version, OS, and exact steps used — that information is what developers or a support forum need to reproduce and track down a bug.