Here is my current grow, 4 White Widow plants, 840 watts from the wall of regular household LED light bulbs in a 5X5. It's 3 weeks and 2 days since flip to 12/12 today:
I hoping for 1 kilogram of dried and nicely manicured bud. I routinely do 1.2 grams per watt easily being lazy with plain LED light bulbs from the corner store (or wherever the sales are!). The greatest benefit to using regular SIL's is flexibility. You start your grow and adjust the lighting from spout to finish, with just a bulb per plant when they're babies, then 2, then 3... I just have them unscrewed in the fixture, and screw them in as I need more light as the plants grow. I also can adjust the colour temperature by just exchanging bulbs whenever I like.
I should also add that this is a "organic" grow, just plain water from seed to harvest. There be worms in there! Lol