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Just two T5HO bulbs are enough light for that size planted tank, and two pairs of those bulbs separated so the whole substrate gets good light is also good. Adding a LED light is very much more than you can expect to use without really serious algae problems.

You need to verify that you have adequate CO2 in the water for the light you have. You can do this by comparing the pH of a sample of the tank water after a day sitting out in the air, to the pH of the tank water a few hours after the CO2 is turned on. The amount of CO2 in the water will be approximately 3 times 10 raised to the drop in pH power. So, if the pH is 1.0 lower in the tank water, than in the sample of tank water, you have about 3 times 10 to the first power, or 30 ppm of CO2.
 

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Light is not measured in watts per unit of volume. It is measured in lux or PAR units. PAR, photosynthetically active radiation, is the best for planted aquariums. It takes a PAR meter to determine your light intensity, or if you have data for very similar lights, you can figure out about how intense your specific lighting is. This: https://www.plantedtank.net/forums/10-lighting/184368-lighting-aquarium-par-instead-watts.html might help you in estimating how much light you have.

Are you using 4 dKH water (distilled water with just enough sodium bicarbonate in it to raise the KH to 4.0 ddKH)? You can't use water from your aquarium, or tap water. if you are, you probably have close to enough CO2 in the water.
 
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