hi there after this vacations i've got a few "good" ideas
Gandalf:
when he is the grey he must not have istari light and his word of power shall be a little weak (well not to weak but not to strong)...
then when he becomes the white, of course he must have istari light and a powerful word of power... ok then when we pourchase Gandalf the white, (i think) it shall appear the sunflare power but makin not damage and the light below of that power is not needed (cuz its the light that comes from the heavens that comes to him and gives him the stage of white)
Saruman:
he is actually perfect, (just I dont know how the power of "the lord of the white council" works and the power which make him a little bit slower)...
so my idea: like i said about gandalf's descending light, for Saruman its reversed, instead the light descends it will go up (when he becomes Saruman of many-colours he lost his light, that's why the light leaves him)... its the same power of the sunflare but just the part of below.
& when he becomes Saruman the blessed his health must be increased (not for nothing is "the blessed") and his last power "Gewittersturms", like the description says: ...he controls the power of the elements...: shortly before the lightnings fall, it should appear the "wind of manwe" but making damage, then at the same time as lightnings fall, rain should fall (which would last so the attack itself)
well hope u like this & take this small but complicated ideas intoaccount
thx