The noun lead (rhymes with bead) refers to an example, an initiative, or a position at the front. The noun lead (rhymes with red) refers to the metal.
LED (all capitals) is an abbreviation for light-emitting diode--a semiconductor diode that emits light.
- We led the game until the eighth inning.
- Now the Cubs have taken the lead.
- "The theory that lead led to the decline of the Roman Empire was first advanced in 1965." (John Emsley, The Elements of Murder)
(a) Your advice will _____ me into trouble.
(b) Your advice has _____ me into trouble many times before.