i have a 93 gallon cube thats only 30x30 so a small footprint. I have an ecotech radion which is 120w as well but with 5w crees and i have 4 t5's. in theory i have almost double the light over a simlar sized area. I have the radion going at full and i still want to add more light.
If you are getting good growth and color then i wouldnt worry about it. If you notice slow or no growth, or bad color i would add more leds or t5's. you basically only have 30watts over each foot of the tank.
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