WoWDB

Blinding Light can be altered via glyph from a 6 second disorient to a 3 second knockdown.  Newer players may wonder why one would sacrifice half the CC duration, but this is a decent tradeoff because damage removes a disorient but not a knockdown.  If you prefer or need an AoE heavy rotation, glyph this spell or you'll almost always remove the disorient early with your AoE spells.  If not, or if you can remember to switch to your single-target abilities, then you'll find this not worthwhile to glyph.