Your florescent bulbs are T12s - those haven't been made for about five year now, so any available tubes are old stock. Keep an eye on the seedlings potentially getting leggy from weak (old) light. If that is the case, buy one of those remaining T12 tubes for your plants.
For T12s, you can put them within a couple of inches from the plant tops without too much worry. But when the sun directly hits that window, I'd keep the shades up as the springtime sun would be a better source of energy for the plants than the florescent tubes.
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