Flourescent lights do not help avoid sunburn when planting out.
If anything, they need to be hardened off even more than if they
were grown under bright metal halides.
You can put them up close against the north side of a building
for a few days (protected from beasts, slugs, etc). The sun is still
to the south at this time of year, so that should be ok, although
a few cloudy days is better.
If the sun is shining, one usually needs to build up gradually
to a full day in the sun (like all shade the first day, hour of
sun the next day, then few hours, and so on).
I have not gone from metal halide to direct outdoor sunlight,
so I don't know how much that changes the time that they
need to adapt. They need to adapt to wind, too, so I start
with a couple of hours in the shade outside, and build up to
a full day gradually, with more and more sun each day if the
weather is actually clear and sunny. (If it is cloudy the whole
time, no big deal. After a week of cloud filtered sunlight, they
can handle direct sun without problems, assuming that they
have enough roots to stay hydrated.)
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