First off, those spot lights give off more heat than usable lumens, and likely you've burned em. Old damage never repairs, so old leaves are old news.

Likely a bit of stunting going on, as changing light spectrums will stress a plant. I've never used a 1000w to grow seedlings, but for 5 plants...it's overkill, lol. 5 feet away is the outside edges of usefulness for a 1000w, but do you have an enclosed hood, or is there even glass between the bulb and the plants? (like a bat-wing or parabolic reflector) Check the "Dealing with heat issues" thread in my signature.

Do not add more nutrients, the soil has plenty for a month or two after transplant. Do not let the soil of a seedling overdry. Conversely, don't keep them saturated, either.

Filling-out the troubleshooting form and providing pix would help. Might be something other than the light. (ph issues, additives or teas...)