I spent a long time bluffing at low limits. As a long term tactic, it simply doesn't work. Too many people will call with anything either through lack of care for the small stake or through ignorance.

It is critical to bluff at late stages of SNG's - blind stealling. More generally speaking it works better in short-handed games. So far as Ring games are concerned bluffs are more effective through specific representation of community cards as far as I am aware.