Hi m8 a few things can make your buds go loose like u say if u let your plants grow to tall with out enough energy for a plant that size
or a low watt light can cause this too another thing it could also be is that lamp u are using i havent heard of it b4 so i could be wrong but if it is giving out a blue spectrum it could be your reason the blue spectrum is whats needed for vegging and for flowering you will need the red spectrum for bud grown