I added 1/4 the amounts of nutes specified to a gallon of distilled water and would spray about three solid squirts around the roots of the seedling every other night before the night cycle. I just noticed the yellowing yesterday.
That plant looks wayy to young to be giving it nutrients.

The first two embryotic leaves you'll see (the round ones, the very first ones that brought the plant from dirt to light) are called cotyledons, aka; seed leaves.

These little guys give your plant enough nutrients up until AT LEAST 2 weeks above soil. (this is why a seedling will grow without light if left in the dark for a few days) Also keep in mind the seed provides quite a few nutrients for the early stages in life.

What were the N-P-K ratio of the nutes you used? How much EXACTLY is 1/4 to a gallon? (1/4 tsp? 1/2 tsp?) ect.

And you're right, CFLs that close aren't a heat issue so you can mark that off of your checklist.

Btw, I'm jealous of your camera.
The Grim Reefer Reviewed by The Grim Reefer on . Yellowing leaves - 2 week old plant It was in a small like 2 pint planter. Organic soil. It had one 60 watt 1,200 lumen blue spectrum blulb on it. After about a week out of the soil I put three bulbs. One 60 watt 1,200 lumen blue spectrum, one 150 2,000 lumen watt blue spectrum, and one 150 what 2,000 lumen yellowish (soft white) bulb. The bulbs were about 6" from the plant and I had a small fan blowing on it. I added no nutes at first. Since then I was informed that the soil seemed compacted, so I mixed 30% perlite with the Rating: 5