With my whites I keep them around 65-70%. Up to 70% and no lower then 60%. I was having an issue finding that info as well, that is the range I kept finding. I messed with it in that range till I found the point where my girls were the most comfortable. I found that 65-70% is where they are the most active. I have had it there for the last year and a half and they are still really active at night and no shedding issues. Of course this is just my experience, some others may have different opinions/experience on this.