for example my opponent has 30 honor and I set his honor to 5, is there a honor loss and he can play for example Thriving Light?
setting honor and honor loss
A topic from AEG's L5R CCG Rules forum, copied for Oracle of the Void from a copy of the forum saved in October 2015, so pages it didn't save are missing. Players' names are left out; the rules officials are named. Rulings are as they stood on these dates; later rulings, the rulebooks and the Rules Archive may differ.
for example my opponent has 30 honor and I set his honor to 5, is there a honor loss and he can play for example Thriving Light?
In order to answer the question, I need to know what particular card/effect you were using to "set" your opponent's Honor.
If, for example, you're talking about Tribute to Your House, that card specifically states that it does NOT cause an Honor loss.