Spell Lights

[Matt]

No: HPFGUIDX 146587

I was re-reading ootp when I had a thought. In using stupefy and 
Reducto and other such hexes, curses, etc, you see a certain color. A 
red beam or a avada kadavra green and such. Why is it that when using 
these type of spells you see the light but in Charms (eg wingardium 
leviosa) and Transfiguration you dont see a light, it just happens. If 
anyone has any in-sight it'd be greatly appreciated.

-Goofball