Fluorescents are more than adequate to get tomato plants to 10" to 14" with thick stems and dark green foliage. To my thinking it has more to do with fertilization. These were 33days from being sown under 6500k T-8's, ProMixHp, Chemgro 4-18-38. FloraNova Grow does just as well, and Osmocote comes highly recommened although I've not used it personally.
Note the explosive new growth tips and sucker development on this young plant. Experiment over the winter, it's not a very big investment of materials because seedlings require very little potting mix and relative amount of fertilizer.
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