Mexican Airlines II... All Aboard Again

Seedling phase and for the most part its just water and let it grow. It's the part of the process that gets me the most nervous because I feel like it's easy to stunt a seedling very early on. Luckily I've had really good results with FastBuds in the past and this plant is proving to be just as good as a seedling. It has easily doubled in size within a week. The leaves are a nice shade of green with no signs of distress. Multiple leaves have come in and it doesn't seem to be stretching for the light. I am watering maybe twice a week and since its just straight water I only water until a little comes out the overflow hole. I normally use my RODI water which is pretty good but I didn't want to replace my filter yet to get truly zeroed out water (TDS), so I am trying out Walgreen brand Nice Purified Water. Straight out the container the TDS is 003. The PH is in a decent range as well. I will probably use for the first few weeks then switch over to my RODI water. The lights were super intense early on and it got me thinking they might be a little too much for seedlings. I looked up recommended light levels and everything pointed to about 7,000 lumens, so I bought a light meter and some dimmers for my Quantum Boards. I was at a whopping 23,000 lumens without the dimmers and the lights at 24". After putting on the dimmers I was able to get them both down to 7,000 lumens without a problem. By the end of week 3 my plan is to get up to 10,000 lumens.