Five - put lights on at night to keep temps up and they cost less to use during night time as well. Nothing wrong with airy buds as it means less chance of mould. Dense nugs are good but sometimes we have to make do with what we can get. My outdoor girls produced extremely airy buds and very little weight. Am starting to see from my balcony plants how much weight i have missed on the outdoor ones but budrot was setting in so decided to chop early rather than lose more from letting them grow. My balcony ones were difficult to flush - 9L pots and took an age to get 7L of water passing through let alone 18L+. Since first flush leaves are yellowing nicely, some have died so picking them off a few at a time but the buds are now filling out, noticed this when i was away for 3 days. Calyxes have started to swell big time. Another flush tonight or tomorrow and cut around 24th. If still difficult to flush them may just give 2L of water every day for the next 5 days then stop watering.