the 8 23watt lights would put out more light than U have right now, only problem would be the temps inside the box. Id say go for em bcuz the more light the better, and 8 for $12 is a deal, get 2 of em so U can have 16 of them, 16 lights x 23watts each = 368 watts total, probably close to 17,000 lumens which would be great for growing. If U can, get half of them in cool white, and the other half in warm white. Warm white is usually used for flowering, and cool white for veg, but if U use both cool white and warm white you'll see better results.
Cool white gives off more blue spectrum, which helps plants stay nice and short during veg and keeps the stretching to a minimum, Warm white gives off the red spectrum which works best in flowering but I've used it in veg for a while and it worked fine, I kept it right at the tops of my plants and I didnt see as much stretching as I thought I would.
U need to lower that light u have to within 2-4inches of the plants or else they're gonna keep stretching really bad like they are.
also those spots that you see are from the Miracle gro. I use the exact same Miracle gro potting mix, and I can tell U from experience U are looking at the classic miracle gro Nute Burn. That happens when U put the seedling into miracle gro before it is mature enough to handle it.
Next time U use it, start off in rockwool cubes or use jiffy cubes, its the exact same germination method but neither the rockwool cubes nor the jiffy cubes contain any nutrients in them and they are perfect for starting seeds in.
When the seedlings have roots coming from the bottom of the cubes, then you can transplant into the miracle gro.
Im just guessing but Im sure U probably didnt do much reading before U started this grow. If U did then U would know what happens when U start with bagseed, why you shouldnt use a "standard houselight" to grow, why U shouldnt start ur seedlings in miracle gro, how close to put ur lights, never use aluminum foil,light spectrums and germination troubleshooting.
good job so far but there is still much reading for you to do.