I dont think its actually asbestos, its called glass wool pretty sure they're not the same thing.
if you want to turn your attic into a grow room, do it properly (means alot of hard work) your going to need to put in a decent wooden floor (the sheets are fairly cheap) fully clean it, make it sterlie and build a manageable grow room that is easy to clean and suits your requirements. with the electricity, it should be easy enough to drill a small hole in the ceiling and run a wire up through there
hope this was of some help
good luck
:thumbsup: