it was probably a hand and a half sword(1/2 hander)
No, it is not a hand and half sword. I own it, so I would know. Besides, King Arthur was supposed to have existed around 600 or 700 AD. There were no hand and a half swords as we know them until the 1300's, and they were invented in and around modern day Germany.
If you really want to settle the debate once and for all, send me a good offer and you can wield it yourself! Yes, it really does blind thine enemies with its light when it is drawn from the scabbard. Scabbard not included.