Re: First time hardening TC rooted plantlets...
Fluorescent light is a good choice -- if they are fluorescent plant bulbs (tubes), even better. At the present size, you'll want about 3.7 Watts per plantlet. Consider giving them a tiny amount of an inexpensive iron supplement.
In my experience, 10cm would be the maximum height before introduction to natural light. The natural light is going to cause the plants to grow faster, and a larger plant will be under stress to develop a root system to accommodate it.
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