Bud hardners

I usally don't have a problem with my buds being tight but this last harvest the buds came out real airy I was just wondoring if there is a nut that somebody uses to help that...thanks

Same or different strain? Sativas tend to be more airy than indicas, also how old is your ballast/light bulb?

Bulb is about 6 months ballist is about 3 years old it's sativa that all I ever grow I haven't changed anything that I usually do my buddy told me about a nut called bushmaster I never heard of It he said it works good but???