Hmmm... I carry 3 lights just on my keychain: lighthound freebie, McGizmo Sapphire, Arc AAA-P.
Personal EDC: HDS Rotary/AOTH Black Sharkskin belt pouch, Bored SF E2e/Milky gen.1 KL1 MOAL/ti tailcap shroud and LX2 clip.
Work EDC: UK 2AAA eLED pen light, Malkoff MD2/M61HCRI, Malkoff 4th Gen. Wildcat.
Two is one, one is none, a lot is not enough.