Yes,, I like the idea's mentioned.
Would not use clamp on lights.unless VERY careful not to splash water.
I once spent the better part of an afternoon washing approx 80 lbs of sand and hooked up a clamp on shop light over the tank while working to set up the new tank.
As water approached to near the surface,,water splashed up and hit the bulb which then shattered leaving all of the broken glass shards in the tank I had just spent so much time and effort setting up.
Had to drain the tank, and comb through the sand trying to get all of the glass out of the tank.
I now drain the tanks down about fifty percent while leaving the hood light over the tank while working in them, and remove the light before re- filling.