Hello Sara!
I tell you what is wonderful, in my opinion, to see so many new growers. Snagging up Mars-Hydro LEDs. I am nearly two years with my Mars-Hydro lights. I have never a problem with my lights. I have three different lights including a Mars-Hydro 48x3 reflector model. I use that model for one week after putting seed into a Root Riot plug for seedling growth. Then that light goes over a small Kratky box growing 3 Chard and 3 Pak Choi plants. Winter greens in a month of growing. Google Kratky for more info on his technique. Normally his technique is used outdoors, in warm seasons. He is a college professor in Hawaii. He would not patent his method.
I get about a gram per watt with my Mars II 900 and my Mars II 700. I use the Hempy technique with 100% perlite in a 3 gallon bucket. No sign of any kind bugs ever. My light schedule is 20/4 and with the Autos it works wonders. I just use GH's FloraNova Drain to Waste feeding schedule and it works great. Don't forget to add the CaliMagic, especially under LEDs. And definitely with tomatoes to prevent Blossom End Rot.
I only grow Autos. Most recent is a World of Seeds - Wild Thailand Ryder. It is reputed to have one of the highest % of THC in the world. It is a Thai Landrace Sativa crossed with a Ruderalis. Unfortunately it is too powerful for me. Sativa overdose I have been told. Have to add an Indica to the oil. If you want to try an Auto, I suggest this one. 70 days from seed to harvest. Twelve ounces from one plant is a nice amount of medicine. Naturally, your results may vary. Especially if you grow in dirt.
Hydro is the way to grow anything, in my opinion. From lettuce to tomatoes to cannabis, indoors or out. My tomatoes grow in a recycling Hempy system outdoors and in a tent indoors during winter, I use "indeterminate" varieties of tomatoes and just move them outside when the weather warms. Basil and other herbs go wild in Hempy. Just make sure to use perlite as your growing media. I buy 5 gallon paint strainers from hom-edepot and put one bag in the 3 gallon bucket with a 5/8" hole drilled in the side centered 2-3/4" up from the bucket bottom for a reservoir, and then I fill it with perlite, then put the Root Riot plug with the seedling into the perlite. Make sure to pour the water/nutes on the plug to make sure the roots grow down to the reservoir quickly. The net bag makes clean-up easy too. I even re-use the perlite and net bag after drying, cleaning and removing the hair like roots. You newbies might want to try the easiest and most productive growing method out there. Hempy.
Good Luck to all!
WJ