I’m growing 3 mysteries and this is my first Legal grow, none of my other attempts made it more than a month or 2 so just gonna let u know what has been workin for me. I started with several plant led bulbs from Walmart and ended up with 5 flood type plant bulbs and rest regular house type, 10 total. That was working for a bit but they started stretching the node placements after 3 weeks maybe. They needed more light. I posted pics in a thread I started when mine were 30days old. Most said looked good couple said nodes were a bit far apart but here’s what I’ve done. Use cococior 30% perlite or so, feeding general hydroponics Cocotek grow A&B. Water or feed when pot gets lite. I have been feeding then water ounce then feed but I’m going by how plant acts. Made a good sized box and lined it with a chrome covered bubble wrap insulation to reflect. Mine showed great growth rate when I put a 75 watt incandescent bulb next to a metal coffee can with water in bottom making box hot and so humid water was dripping out the bottom. I suppliment light by leaving outside when temps permit. All that has worked on a cheap budget but will tell u “u have to have an ass load of light!!! And a steady environment. My bro is growing and keeps moving his around to different places in the house, only got a couple grow bulbs and his r older than mine and mine r 2-3 times the size. I even gave him one of my seedlings that was same size as mine and I’ve passed his by far!!! I topped main stem at about 33 day. Topped 2nd to bottom branches on #1 at 30 to experiment and cloned very bottom set of branches on all at 36 days. I hope this helps in some way.
Pic is of my 39 day old mystery strains. I just bought 2 Vipar Spectra v450 LED grow lights and those things r BRITE as hell!!! Paid $140 each at the local grow supply. Pic of box is with Walmart grow bulbs then with big lights. Both lights installed on last pic.