PC-12 pilot reported receiving a low altitude alert from ATC when they descended below glide slope significantly after entering visual conditions on approach.

Narrative

While flying the ILS approach; after I became visual; I put my eyes outside the cockpit and then proceeded to go well below the glide slope to the point that Tower issued me an altitude warning. I understand the risk involved with going below the glide slope and that I should fly it all the way down to the runway. I know that there can be obstacles below me even though I was visual. In the future; I will continue to fly visually once I am out of IMC; but I will continue to use my instruments as a scan to make sure I'm staying on glide path. Also; and probably an easier reference to use; I will fly the PAPI (or VASI) lights down to keep me on glide path. After some reflection; I believe that I may have gone low once I was visual based on some recent flying experience. I fly a small cub and land it off airport as a hobby. Flying into sand bars and fields does not offer me any glide slope reference. I believe that I have reset my visual sight picture to a low glide slope approach while doing a lot of that sort of flying recently. I will make sure to use the PAPI at my local airport when flying this plane and try to reset my reference sight picture for future flying as well as reminding myself to use the PAPI when it is available.