I've recently been looking into lighting, which is an aspect that I overlooked when setting up my 20 gallon partially planted tank. I currently have a mainly plastic hood with a 15 watt t5 light that is made to fit on it. It has a little glass space that the light sits on top of. Now that I've got some plants that need stronger light, cobombas and crinum calamistratum, I want to get a better light. The lights that I am considering are a T5HO light, two T5s or an 11 watt LED light. On a side note, I am not using CO2 fertilization, if that is any help. Which one of those lights would work better? And also, would I need a new hood or could I keep my old one? Would I need a cooling fan for any to them? I am aiming for a medium to high light intensity.