I find my 8 m2 corresponds to a 10-11 m2 onestrut or strutless, as I can ride from 8 knots with an 11-1200 cm2 wing being 77 kg.
With my 12 m2 strutless I can ride from 7 knots, so go a tad lower but not much.
A 10 m2 light LEI means just over 8 knots on 30 m lines is my lowend.
27 m lines on Peak4 8, and 30 m lines on LEI kites, used always when wind below 10 knots, also on even bigger foilkites for 5-7 knots.
Yesterday out where the wind started at 9 knots, ideal for the Peak4 8 m2, but when I got out around 15 knots was present - no problem surviving, but it WAS survival, not fun at all, had to keep the kite high in jibes, also when going straight, to avoid getting hammered on deathruns.
A 4 or 5 m2 would fit this wind better - but of course, when I went ashore and took my 4 out, the wind dropped again to fit the 8
(which I had not packed down - NEVER pack your smaller or bigger kite down if you go change)
Winter dark and rainy conditions, and wind is often fickle....
I dont snowkite either, but can see those who do ride quite big sizes, seemingly using the same sizes as when foiling?
But I remember from earlier many years ago, when snowkiting occasionally, that if flat and you dont need to go uphill for longer tracks, you can ride with a lot smaller size on snow, as long as it can hang in the air - here the Peaks would shine I think.