[amsat-bb] AO-7 question

One thing I always noticed is that its recommended to not exceed 5 watts when operating on AO-7, but I'm not seeing anything about maximum gain to use. I have an Arrow II handheld yagi and on the 440 side supposedly it has a 10dbd gain which would give me effectively 50 watts output assuming no losses. So my question in a nutshell is, what is the maximum recommended radiated power recommended with this bird?

~73, KC2WQW Ron