Be careful how close you put a light to a seedling. They don't need nearly as much when they are 4 days old. If you have a HID, I would recommend keeping it at least 1 1/2 feet away from it, probably more like 2 feet. About it being skinny, it's only four days old. It's going to be pretty skinny. How many inches is the stem? Get a little breeze going on it and it will fatten that stem right up.
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