I am going to go out on a limb and make a few ppl mad.
Personally I have had tons of powerbars within my room and never had a plant hermie. (Other than extremely late into flower, like 11 weeks on an early strain)
My thoughts are this....There was enough of a trigger to initiate budding by the light cycle changing. Unless the little light was really really close to the plants, it probably will not do a thing. Especially if it is a consistent light.
My neighbor has a porch light that is on every night in the fall. Bright enough to see decently in the dark, and yet no hermies from it. I think it is because it is a constant thing. Take that same light and turn it on and off a few times in the dark and it would be another thing. In nature there are nights that are lighter and nights that are darker, but within the same night it pretty much is constant.
Just some ramblings....if you worry, tape over the light. If nothing else it gives you peace of mind. -BB