Change ref plane direction, or flip work plane of lighting fixture

i have lots of lighting fixtures hosted on ref plane which is in wrong upwards direction
is there a way to change existing host ref plane, or flip work plane of those lighting fixtures

See if there is anything in this post that can help you.

thanks Sean1 for the quick reply! flipping work plane w/ python script seems the only way out.

i tested manually to redraw ref plane (w/ changed direction) and it won’t affect existing lighting fixture via changing work plane but do affect newly added lighting fixtures, anyway, no way to change existing ref plane direction?