Can I move autoflowers into a different tent when they are in bloom mode with a different light strength?

The question u should be asking urself is, does the sun change its intensity throughout the day? Yes it does. So, unless ur switching from indoors to outdoors, or from led to hid, then its safe, the plant will just see it as a reduction in intensity so be sure to place them closer to the light in order to maintain the nearest possible value to the previous par levels.