Hey welcome to AFN brother!
Just some friendly advice, I would start with a handful of autos instead of 50 autos for my 1st grow. I can tell you're eager and ambitious and that's great, but get your feet wet first and then start scaling up if that's your goal. I don't think you're going to remotely reach whatever goal it is though by going so big right off the bat. I'm not saying that to be a downer, but to be realistic so you're not wasting your time and money. Get a firm grasp on the basic of autos (which can be much more fickle than photoperiod strains and clones,) and then push up. You can still use both of those lights for sure but the amount of plants you want to put under it is likely going to be overwhelming for a 1st grow (it's probably overwhelming for most people here.) That's my best advice to you bud!