Is there a way to add code to a html index page that has several dozens of images?
If you mean a gallery type effect where clicking on an image pops it up in a lightbox AND THEN allows you to scroll through the rest of the images, this is possible by simply adding the lightbox interaction to each image in turn and ensuring that they all have the same gallery name.
This will create something that looks like this.
If you don’t want to display all the images on the page, but only have them show in a lightbox, simply turn visibility off for the images you don’t want displayed on the page - leaving one image to act as a trigger for the lightbox. That sort of arrangement would look something like this.
If you have a large number of images, it’s usually best to put them all into a single bloc, leaving just one trigger image in another bloc that remains visible. You can then turn off visibility for the whole block of lightbox images
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Thank you for taking the time to put that together. 
Is there a way to adjust size, maybe fade in/out fx between every photo? I also cant find a way to loop the viewing. My first photo only shows left direction for next photo < . . even its frst on the gallery.
But yes, the lightbox implementation is very raw. Some fx between each photo would be really nice. What are the options? Thank you.