Brilliant Energy
A brilliant energy weapon has its significant portion transformed into light, although this does not modify the item’s weight. It always gives off light as a torch (20-foot radius). A brilliant energy weapon ignores nonliving matter. Armor and shield bonuses to AC (including any enhancement bonuses to that armor) do not count against it because the weapon passes through armor. (Dexterity, deflection, dodge, natural armor, and other such bonuses still apply.) A brilliant energy weapon cannot harm undead, constructs, and objects. This property can only be applied to melee weapons, thrown weapons, and ammunition.
Strong transmutation; CL 16th; Craft Magic Arms and Armor, gaseous form, continual flame; Price +4 bonus.
这个武器的作用原理是它忽略非生命物质。上面说的那些东西只要是活的,那就遵循这种情况下的正常的规则,光能武器和别的魔法武器没有什么两样。