Originally Posted by dwalstad
......One thing you can do is to lower the water level temporarily. This will make it easier to do water changes and increase the amount of light getting to your young plants. At this time, you don't need 65 gal of water.
I am pretty sure that you get less light at the substrate level if you lower the water level. This is because much of the light is from reflection from the glass to air interface. Reducing the water level reduces the reflection, allowing more of the light to escape through the glass. I was amazed when I did some testing with my current light system, and found that the intensity was much greater outside of the center of the tank, not less as I was expecting. Theoretically this is always the case with the glass clean both inside and out.