I've added a few light effects in Photoshop. When I export it i.e., save a .jpg or any other format all of the layer that have the light effects applied on are coming out full black. The effects aren't being rendered/exported in the output file. How do I render the image with the light effects applied? I can see the effect applied in the Photoshop file. But the output is black.
Just make a group to all layers of which you need to export in JPEG.
You can achieve this by selecting all layers and using Ctrl+G to make a group. Then make a copy of this group by pressing Ctrl+J, then select and right click on the duplicated group layer and click Convert to Smart Object option.
Hide all layers except this layer. Now Export to Jpeg.
Your issue should be resolved.