Every spring my plants come out of dormancy in mid-February..they sit in front of sliding glass doors, indoors, to come out of dormancy..but its still too cold to put them outside for the season..spindly weak growth starts up indoors Feb-March..they get direct morning light, but not nearly as intense as outdoor light on the deck..
finally sometime in April they go outside for the season..
those first weakling leaves fry..
new growth quickly replaces the burned leaves, and the plants are off and running..
the "burning phase" is only a few weeks in April..after that all the new leaves are fine and the plants are totally acclimated to the sun
for the rest of the season.
been doing it this way for 15 years now..the plants are perfectly fine.
happens with all my VFTs and Sarrs..I dont think the burn can be prevented, and IMO and in my experience it is unnecessary to try..