Lots of lights are better than sunlight. Not in energy use, of course, but in lumen output, which is what matters to the plants. If you keep a 1k, or even a 400 watt light, close enough, it's more light than sunlight could possibly provide. I think I read that sunlight provides about 5000 lumens per square foot. My 400 watt light with a decent bulb spits out 55,000 lumens, and I use it in a smaller space than 11 square feet, so you do the math: it's better than sunlight.