I use 2 of these Green LED lights staggered in the same spot.
https://www.amazon.com/Amarine-made-...ef=ast_p_pc_rc
One right on top of the other with a small piece of pool noodle float them. Fits right over the end of the light. One about foot deep to the start of the lights and the other right below it. I usually push them out from the boat with an old fishing rod or something else to be able to fish around them good and vary where I'm at in the light.
One might be good enough. If you want to try before you buy a second. They don't pull that much power at all but are very bright.