In my experience I have gotten hard rock buds and airy buds from 250w MH and HPS what ever was closer to the light was denser for sure. The pic I put up of the turkey bag of ch4 and the jar of ch5 and the jar of purple green crack, the ch4's were taller and thus has rock hard baby fist buds and the others were more airy and we were using 400w's plus it depends on how many plants you have going and the genes. if you are growing say 3 plants and you top them and keep them short 250w will give you hard nugs unless the genetics are naturally airy, thats my 2c.
check this shit out, I read a few reviews and all were good and said this product is great:
http://www.420science.com/420preserve so what ever jars you have this will keep your nugs nice and fresh for as long as you use this product especially if you have a lot of bud and you know you will have it for a long time like my buddy who constantly sits on a pound and a half for himself and he doesn't sale shit he is just addicted to growing and is the master grower on the little co-op.
The chemicals in it are argon, carbon dioxide and nitrogen which are all used for preserving all kinds of food and approved by the U.S. FDA (food and drug administration)
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