Experiment reflection Test Take a flashlight at night stand on the shore line point the beam at 45 degree and the light will bounce off the water upwards into the trees.
The reason for this is light is reflected water not being unobstructed. Very small amount light will be absorbed by the water itself in this test.
Reflection underwater Same effect will happen in reverse with submersible fishing lights. The rays will bounce off underneath the water surface and particles floating in the water and boat downward into the water. Creating a mushroom effect. Adding more rays of light
Submersible fishing lights have been proven to be more effective, so when shopping for fishing lights give it deep consideration for submersible lights.
Above Water Lantern Lights Have an are being used, but gas & flames are not the best idea! (usually a Coleman type lantern). This method does work to a certain degree and are still used by some. This approach is very limited to the amount of light it can deliver through the water. Most of the light is reflected upward making it difficult to view the bait and/or fish you are trying to catch. Mosquitoes and other bugs are an issue as well.