@elkeps

Thank you very much, glad you mentioned that. I looked up my filter which is a B+W UV Black #403 Filter.

Product: https://www.bhphotovideo.com/c/product/937307-REG/b_w_65_1070991_46mm_uv_black_403.html

I now realize the 403 filter is the name, not the nm. But indeed these are Ultraviolet photos, as the #403 product passes UV A radiation (320 to 385 nm), but blocks visible light. Also my GH3 has a clear (full spectrum) hot mirror so it should be capable of seeing such spectrums.