Am I doing it right?

So I'm a newbie at this...
I have two plants growing right now with 1 42w Florissant light fixture about 2 inches away from each plant. So thats 84w for both of them. The package said each gives off about 2600 lumens. Is that enough for them to grow? Cause I have been growing for 64 days now and they are about 14 inches tall. With like 7-8 rows of fan leaves. I know I can add more light, but is this enough for right now? Do you guys need to know anymore info?
 
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