photon art levels

[nanoblaster]

if you read the discription on a photon art it will say how many attacks it does
example:rising crush for twin sabers has 3 attacks.
when you get a photon art with more than 1 attack to lvl 11 you can press the button again to do the 2nd attack of that photon art and if it has 3 attacks you can use the 3rd attack when you get it up to lvl 21. try it out if you didnt know this already.

[Dhylec]

This sshould be common knowledge. The main reason people level up their PA's isn't just for grinds, but due to the additonal attacks/combos/effects.

[Kaydin]

Single handed weapons have 2 attacks (second gained at 11), dual handed weapons have 3 attacks. But yeah, it's very well known. >.<