Lighting an image with a free iPhone app called MyLite. It’s actually a pretty robust flashlight. Compare the center “R” on the top photo to the one on the bottom. On the bottom image, during a 15 sec. exposure, I “painted” / lit the center “R”. Lighting it makes all of the difference. Image made on a Canon 5D Mark II, 2.8 @ 15 secs.
Lighting with an iPhone app