I'm using mine at 22-23 watts! I find it's perfect at that setting ... either my meter's reading low or I prefer lower temperatures than most on here 
Edit: It's 49W at 100% so seems like my meter is accurate. 22-23W it is for me and I find that to be ideal ... this is routhly 80-90% of a visible dial back from 100%.

Edit: It's 49W at 100% so seems like my meter is accurate. 22-23W it is for me and I find that to be ideal ... this is routhly 80-90% of a visible dial back from 100%.