I started learning blender 2 months ago. . Everything was fine till I rendered it, after it rendered I noticed that the plane on which the bulbs were becoming bumpy and distorted in shadowy areas I think, I tried different things to fix it by turning clipping distance, changing f-stop and changing sample data and denoising but nothing. the problem only appears in the rendered image not in the viewport which makes things even more difficult because it takes hours to render a single image on my pc please can anyone tell me how to fix it Look at this as you can see the image has distortion in the shadows I marked it with a pen as you can see the white area has very low distortion, the yellow has a little distortion and the red area has a very high distortion. can u please help and tell me what's wrong with it?
That "bump" is the result of a denoiser not having enough samples to produce a good result. If it only appears in the rendered image you need to make sure you have both denoising checkboes - under "Viewport and "Render" - unchecked.
That solves the "bumpiness" but might still leave your image noisy. Usually I would suggest enabeling the "denoising data"-passes and plugging them into the denoise node of the compositor, but i'm not sure that this will produce good results with all the glass in the scene. In that case increasing the sample count will do the job as well, just slower.