hi im on my 7th week of flower and im having problems with my humidity , its at 47% with lights on and 75-80% with lights off , can i do something more to my room to help lower it ? or do i need to go buy a dehumidifier ? if i really need a dehumidifier can anyone recomend one for about £100

room spec is 7ft l x 4ft w x 7ft h
600hps one end 400hps other
2 x 4inch carbon filters extraction one end , 1 x 6inch intake other end
15inch fan blowing under lights , 12inch fan under canopy
lights on temp 30 , lights off temp 20

if any more info on my room is needed just let me know