I purchased two Vipar Spectra 300 LED Lights. I am...

You probably would't need the second one until early-mid flower. And there is an advantage to keeping it: assuming you have adequate soil/space, the limit on your grow is your lighting. The rule of thumb for a grow is that a beginner should expect, if no catastrophes, about 50% of the wattage pulled from the wall of the grow lights. Assuming each draws 100W, then using one means 50 grams would be a reasonable expectation for your first grow. Two of them would double that: you could expect 100 grams from your first grow. And using the "one gram per watt (from the wall) rule, 200W from two lights means you could aim for 200 grams with 2 lights whereas 100 grams would be the ceiling with 1. Either way, the big thing to pay attention to is keeping the light in the sweet spot. When its there, the leaves seem to "pray." Too close and they'll curl, then bleach, then burn; too far away and photosynthesis will slow to the point the plant can "stall." Though that's part of the learning curve and part of getting used to your lights.