Recent trials and errors with chemistry and light- the above two images are printed on Ilford RC paper, exposed for a second (literally turning the bathroom light on and off). The light source was that of compact fluorescent bulbs, about 8 feet above the contact printing tray, development in Kodak D-76 with recommended time and temperature. Interesting results. As you can see there is an uneven development of tone over the image.

Above, exposed with a 100 watt frosted glass incandescent bulb, placed about  4 feet away from sensitized paper, in this case,  an Ilford Multigrade fiberbased paper. 1 potato exposure, #4 filter. Similar results with regard to the inconsistent tone.