I purchased the odyssea 4x24watts t5ho for my 20 gallon tall planted tank. When I first got it I did not have my co2 equipment yet so I only ran two bulbs...obviously algae took over. I then experimented with window screen to help cut the light and it helped dramatically. Now...the tank has pressurized co2, dirt substrate with black diamond cap, modified ei dosing, and that same light fixture but I run all 4 bulbs for 6 hours. I'm trimming some plants every week! It's awesome. My point is...get the odyssea and there are a lot of ways to cut back the light without hanging from the ceiling. Once you get started with low tech and you become successful, you're going to want to try harder plants that require more effort.