I figure around a half pound. However I don't weigh. It is for me. One thing I do do is only take off easy leaves and jar it with the leaves remaining on. Finishes slower for me. I trim it as I need it. Sitting for hours pruning is not my thing anymore. As far as distance for light, I just watch for top burn or leaves curling. My grow room has a central air vent in it. When it is 95 out it stays 72 or 73 with low To mid 50's humidity.