michele wrote:

I start quite a few seed indoors and was wondering if fluorescent
light can be used once the plants emerge rather than grow lights
(since I have quite a few fluorescent fixtures and bulbs not being
used).

Four tubes are enough for four trays. Try to keep the tubes between
2 and 4 inches from the tops of the seedlings. A matte white cardboard
panel in back of the seed trays will reflect otherwise wasted light
back to where it can do good.